Don’t be dishonest, you did more than that. The enemy you’re creating is the “evil centrist”. Your own example does not support that simplistic view.

Achievements like Civil Rights didn’t come about because just a small part of the “left” pushed for it. It came about because the majority of the left stood for it. So no, you don’t get to take all the credit and YES, you’re splitting the party for no discernable reason.