Those people need to be pushed out early and often. That's what voting is for. You need a supermajority to force an end to discussion, and a majority to make a decision. If you hold up the discussion too long with too slim a minority, the majority can fork your faction out of the group. If the end of debate has been forced, and you can't work with the majority, you should leave yourself.

None of this letting the bullies get their way until everything is a disaster, then splitting up anyway stuff.

The core of the issue is that drama is a way to impose your views of the world.

In foss software you quite literally don’t have to agree. You can fork the software and walk your own path. You can even pull changes from the original codebase, most licenses allow that.

Consensus is only necessary if you care about imposing your views of the world onto others.