The herd mentality is an essential biological feature of H. sapiens. We need to be part of a strong social group. It's a matter of survival, as groups commit intraspecific depredations--war--and weak social groups are slaughtered.

This is a large part of why the enemedia work. They are the means of recruiting people into the large and powerful social group they think will protect them from such enemies. The truth, however, is that social group (corporations, the USG, etc.) fund, arm, and train those very enemies, such as Hamas, and al Qaeda, to attack civilians, so that civilians will grant that social group any power it says it needs to protect them from their enemies.

It's an old trick, and people are kept busy trying to pay their bills to prevent them from having the time to learn it's being used on them.

Money is a trap.