What kind of excuse is this for someone handing out legal advice?

Lord Goldsmith said his critic was "entitled to his own legal perspective".

"But at the time and since then many nations other than ours took part in the action and did so believing that they were acting lawfully," he said.

It either *was* legal or it wasn't. But "everyone else was doing it too" is wholly irrelevant!

Update : by coincidence, the Captcha for this blogpost is "fangs".