SNOOPING AROUND

Whomever is snooping is looking for private information (obviously). I can't boast of not doing it at some point in time-you just have to find out something you don't know or what someone is hiding, lol but what's the point really. What do we gain from reading someones diary or going through someones phone and emails?
Nobody ever snoops for the right reasons. Most of the time, almost always, you get to find out things you don't like that changes your mood or changes the way you feel and relate with the person so what's there to gain?
Is there any gain in what in finding out what people say about you in their conversations or that you are being cheated on? If you must know, do you have to find out through snooping around? I don't think there is any form of satisfaction to be gained from snooping. Am i wrong