The people you've mentioned have sworn loudly enough that other people could hear them. Just because you haven't seen them do it on camera, doesn't mean it hasn't happened.
Fred Couples swore on camera at the Bob Hope (IIRC) one year. He dropped his ball, it settled down, and a guy nearby chuckled. Fred said "You think that's ****ing funny, do you?" Picked right up on camera.
These guys all swear a helluva lot more than you seem to want to believe.
Yes, let's listen to the guy who cheated on his wife with a fellow PGA Tour player's wife (and then divorced his wife so he could marry her). Plus, Tom Watson swears too.
Guess what @tmac20: Neither spitting nor swearing bothers me in the least. And that doesn't make me better or worse than you. It's just how I feel about it.