Why do drivers BRAKE CHECK other vehicles?

A brake check is when one vehicle applies its brakes, forcing a vehicle behind it to slow down.

It is one of the most unsafe things a driver can do, since it increases the possibility that the following vehicle will hit it you and cause an accident, possibly involving other vehicles. And why not pay more attention to what's in front of you than what's behind you?

As this video shows, often a brake check results in an accident.

So why do people do it?

Some people have told me they don't like the vehicle behind them following so close. Okay, fine, but why cause a situation where they're going to get even closer, and likely hit you?

Opinions on why drivers brake check are appreciated.

Updates
+1 y
I understand people don't like tailgaters, and the best way to change that is to move out of the way and let them pass you.
Why do drivers BRAKE CHECK other vehicles?
Post Opinion