Even if that is the reason, you wouldn't actually really help.

You know how f'ing frustrated we all get when we sit down for some good internet-connectivity requiring activity, and then the damn wifi doesn't work? Very. That is not the kind of mood most people decide "I'm gonna go do some homework now" in.

I CAN see a valid usecase in knocking people or a person off a network, depending on the situation, but that still doesn't resolve the other point - if you're serious about getting involved in the kind of shitty circumstances that could ethically justify knocking people off the wifi, then you should have the dedication to look up the info on the subject.