MLK wasn't marginalized. MLK was upheld by the establishment.

Since you take the left at their word for what they say in speeches, you have no cause to suggest that Trump is marginalized in the present by the establishment:

Biden reached out to those voters who supported President Donald Trump, telling the crowd of supporters: “They are not our enemies. They’re Americans.”

“This is the time to heal in America,” he said.

“I will work to be a president who seeks not to divide but unify. I won’t see red states and blue states, I will always see the United States.”

These strategically posed sentiments in MLK's speeches were written by a communist named Stanley Levinson, who quit the CPUSA to run King's organization.

Just as the far-left shot of the 60s was to gently persuade the White majority to relinquish power via appeals to their consciences, a time-transposed MLK would be today doing BLM shit.

People to your left and right are telling you you're wrong because you're wrong.