I always try to answer a prohibited question in the comments before it gets hid, since it is helping the person, and they know(hopefully) not to do it again. But I've seen that nearly everyone who flags, simply flag and comment about the perpetration, and leave.
I've also seen multiple people say that it is a waste of time... How is it a waste if someone, somewhere, is getting something useful out of it ?!?
I'm sure that if this was real life, people wouldn't be this way, but why have people become so Percy Weasley-esque about rules?