I unfortunately can't find a reference (but I'm hoping someone else can!), but my understanding is that group conflict is often greater between those who have s

I unfortunately can't find a reference (but I'm hoping someone else can!), but my understanding is that group conflict is often greater between those who have similar ideologies than between those of very different ideologies. For example, Emacs vs. Vi rather than Emacs/Vi vs. Visual Studio or Lisp vs. Scheme rather than Lisp/Scheme vs. everything else.