Jonestown was a small commune.

When you isolate people from the larger society they are more susceptible to the will of a crazy but charismatic leader. Not exactly a positive thing.

Than again, most of Germany believed in Eugenics and Hitlers belief in eradicating the Jews and other undesirables in order to benefit a fictional "aryan" race.

So maybe people are susceptible to that in large groups as well...

My point is, I doubt small social structures are really any better.

I will agree they wouldn't be able to amass the army Germany was able to and cause as much havoc and destruction.