The "center" of American politics is not a fixed point, it shifts over time. What is "the center" today would have been considered pretty far left in the 1990s. Likewise, what was the imagined "center" in the mid-1980s would have been considered pretty far right in the 70s.

One of Lincoln's skills as a politician was that he moved the center of American politics into an antislavery place, and he also evolved in his own thinking about slavery and race. Finding and helping to move "the center" is one (not the only) form of effective politics.

There is no such thing as a democratic political culture that lacks an imagined "center" and people who inhabit it. This is especially the case in a diverse and often fractious nation. The politics of persuasion is all about moving that imagined center in the direction you want.

Most of the people currently on the American far right are highly unlikely to move to the center, because their basic political commitments are hostile to America's multi-racial democracy. One task ahead is to prevent that segment of our political culture from growing.

How to do that is unclear. History shows that deplatforming can often work. History also shows that sometimes right wing radicals can gain fame and attention by presenting themselves as "martyrs" who've been persecuted by "elites." There's no iron clad formula.