Except in rare circumstances, "collective responsibility" is very hard to prove in the courts of law.
When a large section of a society dislikes certain thing, yes, it is possible to prosecute groups. When is this possible? Crimes against humanity is one such example. Or going after mafia or biker gangs. Otherwise, at some time or another, it is very easy to convict influential sections of a society. That's why judges, lawyers are not keen to press charges against an individual just because such an individual is part of some kind of collective responsibility.
I don't disagree with your original points. It is an issue of enforcement. Collusion between individuals or between groups is really hard to prove, except in war crimes/mafia wars/etc.
When a large section of a society dislikes certain thing, yes, it is possible to prosecute groups. When is this possible? Crimes against humanity is one such example. Or going after mafia or biker gangs. Otherwise, at some time or another, it is very easy to convict influential sections of a society. That's why judges, lawyers are not keen to press charges against an individual just because such an individual is part of some kind of collective responsibility.