re: Why are people on the left so mad?

They have completely turned their backs on God and western culture.
This is exactly what the U. S. S. R. wanted when they started their psychological warfare project during the late 1940's.
The U. S. S. R. just didn't make it to see the fruit of their labor.

They have lost their faith in God and worship the Marxist agenda.
We will not be able to break their mental conditioning.

They will continuously get more violent until they start conducting terrorist attacks, like the shooting last week.

We will be in open civil war within the next decade and we will have to kill them all. I can see military stepping in to restore order. This is when we stop being a republic and become an empire. This is what the powers that be want.

Hopefully we can isolate them and keep this from happening. But if the civil war starts, we can kill the communist among us.