In a word - emotion. To be specific, fear which is largely responsible for survival is a huge contributor.
In general, Those who can manipulate others emotions by triggering them can manufacture certain outcomes. If you create a environment of fear humans can do a lot of things that otherwise outside the context of fear would be unspeakable.
Fear in the masses usually leads to confusion and/or convictions. Confusion is what allows bystanders to do nothing. Conviction is what allow doers to do.
In general, Those who can manipulate others emotions by triggering them can manufacture certain outcomes. If you create a environment of fear humans can do a lot of things that otherwise outside the context of fear would be unspeakable.
Fear in the masses usually leads to confusion and/or convictions. Confusion is what allows bystanders to do nothing. Conviction is what allow doers to do.