I've seen this comment every time a discussion about open source, and I think it is incredibly stupid to justify his complaints like this.

What does he have to complain about? That they followed his terms of use? I can complain about people using my stuff in the way I tell them to also, but that doesn't put me in the right.

It's more a comment on the justification for authors to shut up because of what's in the license, which is far more stupid, sorry.