That's what happened during the Civil Rights movement, after all. People saw a huge, intractable problem. And they decided to put their petty differences aside, and they decided they needed all the resources available to fight discrimination and racism, especially institutionalized racism. So white people and black people and everyone came together and did what was necessary, but without violence.
My Calabrese* grandfather who had nothing to gain by doing so made local stands against discrimination and hired black people to work in his stores. Others like him did the same, until these small isolated acts became a movement.
Identity politicians believe this work is not completed yet, and so they continue their efforts to keep this issues visible and in the public eye, and to push for greater equality--political, social, economic.
*in large part known for their anti-black, homophobic, and sexist sentiments