"rightfully" is a value judgement, and not one I agree with. Exploitation of software bugs for personal enrichment is not morally right, in my opinion.
Arhag really already covered the "legal arguments" in his initial post: under traditional legal systems, there is a distinction made between the spirit of the law and the letter of the law, and I'm very happy I live in a country where the spirit overrides the letter.
But please read the last paragraph of my last post and understand that all "rules" are just agreements between people, and there's no way I know of to currently enforce blind obedience to such laws in the face of disagreement by enough people. I'm very glad this is the case, and I fear a world in which it's not.