For the record:
My law of idiot inclusion: Any sufficiently large group of people will include some truly awful idiots.
Merely finding an idiot in the group with whom you disagree is not sufficient to damn that entire group as idiots.
One should also consider my corollary of idiot prevalence: While all large groups contain idiots – some groups contain observably more idiots per capita.
There is some value to measuring the density of idiots in various groups.