It’s ideology versus reality. Here on Lemmy I’m sure you’ve seen plenty alienating potential allies over ideological purity. The problem with ideologies is that they are ideal but not real. Clinging to them dogmatically might give you a sense of superiority and insulation from blame in your own mind. But to everyone else you are still a big part of the problem. What is the value of an ideology if it cannot accomplish anything good? What good is ideological purity? Is useless. And yet many people still use it as a substitute for a personality.