It's so stupid. Like they think by showing the replays they are somehow offending someone. It's so ridiculous.
Please, please, please show all replays stadium people! And show the controversial ones in all angles. You're totally right that if it's a legit call then most of the time the crowd sort of groans and gets over it. When it's left in question the crowd really goes nuts. Oh, and if it really was a bad call then it's totally appropriate to let the ref's hear about it.
You are right, right, right!