I picked up a hitchhiker then kicked them out of my car in the cold and snow.
Did you seriously dive away after kicking him out?
I did but stopped down the road to change my oil. Looking back, I can see him trying to get another ride.
You shouldn't kick someone out if you have offered to take them somewhere. That could put them in a dangerous situation.
I decided dropping him off would be too far out of my way, and i really don't care if he gets hurt.
You offered to give him a ride and let him in the car so changing your mind at that point is rude and kicking him out without warning is even worse. At the very least you could have said you can take him as far as a certain spot since it was going to take you out of your way. That would have been the polite thing to do if it was really going to be a problem.