I'm not an ideologue, but historically, centrism (or, to be more precise, liberalism) has done a pretty poor job of defeating extreme points of view, because they typically won't do what's required to resolve the conditions which lead to extremism, and the response to threats to the status quo (socially or politically) are more often met with repression.
The adage "scratch a liberal and a fascist bleeds" doesn't come from nowhere.
Letting slightly less people die is not compromise, allowing any genocide is not compromise, allowing people to starve is not compromise, Bernie was our compromise and Liberals would rather watch Trump win than accept our compromise.
Which didn't stop the genocide, and handed the administration over to the party which immediately undid what little resistance the last party did enact, thereby making the genocide worse. No one with critical thinking skills could feel better about themselves for that.