It is a self-fullfilling prophecy. If the community would adopt the style of not juding the person but only the product, that community would not care for that person. So the "I don't want to join a club with purpose X because of guy Y" leads to the problem that you are describing. If everybody would just "I join the club because of its purpose X achieved by means Z", that community split won't happen.

Yes, if the community would not be influenced by the guy, he wouldn't be influential.