Of course what we should all be aiming for is a win/win situation.
All this sort of talk is a symptom of lack of resources and/or poor management - don't shoot the messenger!!
On the question of being called at 1050 to cancel a standby starting at 1100 and then be put on a night flight I would have thought that being called at 1050 constitutes having your rest interrupted prior to the standby. This effectively means that you have been on duty and therefore require minimum rest before the next duty which might put you out of hours for the night flight.
There are times where organisations such as airlines rely on the goodwill of their employees. This is ok if it happens on an occasional basis but when it happens all the time people, quite naturally, get a bit peeved about it.