Having doubts on anti-revisionism and purges

First of all I’d like to say that I agree with a lot of Maos work on mass line, criticism, new democracy etc…
But what’s keeping me from being a Maoist is anti-revisionism. Of course I agree that revisionism should be fought, but how? Just executing everyone who deviates from Marxism isn’t a viable option, and if that is necessary for the system to function then maybe theres a problem with the system. I also feel like Stalinist purges were in a way problematic. I doubt that all party members that were purged were Nazis. Bukharin might’ve been a revisionist, but his core idea wasn’t problematic: socialism isn’t just poverty for everyone. So his ideas should’ve been adapted to Marxism instead of killing him.

I feel like anti-revisionism most of the times just end up being « youre not my exact type of socialism so you’ll be sent to a gulag ». Of course thats an exaggeration but it often becomes an excuse to fire someone or to make someone look bad until it doesn’t really mean anything anymore