Should, but isn't, unfortunately.
Honking to provoke someone into taking risks you don't have to incur the consequences of yourself is mild sociopathy.
I agree. The fact that the risk is theirs and that they are obviously not confident drivers is exactly why I don't honk. I neither want that on my conscience nor want to be secondary damage when they pull out at the wrong time and cars and debris go flying.
And I say this is the kind of driver cuts my left turns closer than most. You know the driver that's already started their left turn before you've cleared the intersection, and it looks like they're going to hit you (but won't)? That's me; keep it movin' folks. But if the driver in front of me is less aggressive (to a point), that's cool.