If The Avengers are his friends, then what is Bucky? That's his actual friend, not somebody he's on a team with. And why kill somebody who was a victim himself? You're acting like he wanted to be made into a killer.
Fred.
Bucky tried to kill cap too. He's clearly a liability, unfortunately cap has " special feelings" towards buck, that's the explanation
Tried to kill him and all his crew.
Those effimate soul ties were too much.
Now cap is a liability
Sending the gawd Tony a love phone, talking about " I'm always here Tony; you can call me"