My reading is the only thing preventing a considerable portion of them from killing is law enforcement, and the fact that most societies has evolved past supporting violence.

You have to observe that deadly violence was normalized in the past.

It was even entertainment in Rome. Hence, the Colloseum.

Externally, it's evolved, but internally the ideolog is quite similar.

Some of the similarities are:

- divides men and women

- interferes and intends to control families

- demonizes people that are useful to society and accumulate wealth