It's important to separate the distinction between legal and illegal, and right versus wrong (morality). the two are sometimes correlated but they do not necessarily have to be. It's much easier to prove something legal or illegal because you just look at the laws on the books. It's like a mathematical proof. It doesn't have to be morally correct but it can still be legal.

The holdup are people confusing this click fraud with immoral. It seems to be very clearly illegal by the books, but in my opinion a moral and right thing to do