Eight years ago, at the dawn of the Obama era, pundits seriously debated whether the election of the nation’s first black president would mark an end to the country’s long history of racial inequality. Weeks after Obama was elected, Forbes Magazine jubilantly published an editorial headlined “Racism in America is Over.” While few others went quite so far, seven out of 10 Americans did believe that “race relations” would improve as a result of the Obama presidency.

What happened? How did we get from the optimism of the Obama presidential run to the eruption of a protest movement calling itself “Black Lives Matter”? Perhaps the optimism itself is to blame, or rather the contrast between Obama’s promise and the reality of his tenure.

There were sky-high expectations for Obama when he became president. This was especially true of young black people who gave Obama an unprecedentedly high share of their vote, twice. Expectations were also high because the conditions were so poor. The Obama Generation had come of age in the shadow of Hurricane Katrina, a decade of never-ending war in Iraq, and the instability of economic crisis, home foreclosures and growing student debt. In 2006, 52% of black youth aged 18 to 25 described the U.S. government as “unresponsive” to black needs, while 61% said they experienced discrimination when looking for work.

But instead of championing government initiatives that could attend to the crises of poverty and under-resourced institutions in black communities, the president maintained that he was the president of the United States, not the president of Black America. When Obama did intervene, it was to champion a measly public-private partnership known as My Brother’s Keeper that focused on poor and working-class black boys while ignoring the plight of their girl peers. More important, MBK was not public policy, but a program based on the generosity of other nonprofits and corporations.

With each passing year, it became more obvious that Obama could not live up to the promises of change that animated his presidential campaign. Indeed, by the summer of 2012, in the heat of Obama’s reelection campaign, black unemployment had risen to more than 14%, and 38% of black children were living in poverty.

Nor did Obama move to reform the criminal justice system. Almost two years in to his administration, legal scholar Michelle Alexander published her best-selling book “The New Jim Crow,” which provided a language to capture the devastating effects of mass incarceration on the African American population. Obama didn’t run with it.

Indeed, two moments highlighted Obama’s paralysis on this subject: his lackluster response to the Troy Davis campaign, and to the George Zimmerman trial.

Davis, a black man, was convicted in 1991 for the 1989 murder of a police officer and sentenced to death. But Davis maintained his innocence and many believed him. Leading up to his September 2011 lethal injection date, an international group of luminaries, including the pope, the head of the European Union and a former director of the FBI, pleaded for a retrial or clemency. Black college students in Washington, D.C., marched on the White House and the Supreme Court. But Obama never even made a statement regarding Davis. Instead he left it to his spokespeople to say that he had no jurisdiction over the matter. Davis was executed.

In the summer of 2013, when Zimmerman was acquitted in the murder of Trayvon Martin, Obama was less quiet, but equally disappointing. Young black activists hoped Obama would use his position to elevate their concerns about inequality in policing and the judicial system more broadly. Instead Obama reminded the American people that “we are a nation” of laws, ignoring how the laws do not always apply to everyone equally.

Nearing the end of Obama’s historic presidency, what can honestly be said to have changed in the lives of young, working-class and poor African American youth? Unemployment and rates of poverty remain high, wages remain low and police violence and abuse continue unabated. When the political establishment and the political institutions of our society fail to improve people’s lives, they begin to lose their legitimacy and people either tune out of politics and society altogether or they find other means to compel the changes they seek. Often this is through political activism.

Thus we arrive at the most recent eruption of demonstrations against police violence in the aftermath of the highly publicized killings of Alton Sterling and Philando Castile. Although activists have met with federal officials, including the president himself, Obama’s apparent inability to rein in brutal police while repeatedly lauding their supposed heroism reinforces the perception that the only way to transform these conditions is to vigorously protest them.

We can, of course, debate whether it is realistic or fair to expect a president to effect real change in a scant eight years. But Obama did not run on “yes, we can (if I have a Congress to my liking)” or “hope and change (if the 2010 midterm elections go my way)”. And if it was unrealistic or unfair to expect Obama to succeed, then surely it’s worth asking why it was so important to elect him in the first place. Rarely will African Americans publicly criticize the nation’s first black president, but their frustration with the status quo can be measured by the intensity of the protest in his final days in office.

Keeanga-Yamahtta Taylor is author of “From #BlackLivesMatter to Black Liberation” and professor of African American Studies at Princeton University.

Follow the Opinion section on Twitter @latimesopinion and Facebook