Quote from shortie:
he probably did it because of his beliefs.
The problem with doing it by his beliefs strays into the realm of moral relativism. What if his beliefs are based on a lack of information or knowledge? What if he is a lunatic and his beliefs are anti-social?
If what he is exposing is criminal behavior, that would be one thing. But diplomacy has always had a part that deals with unsavory characters. At one point the US even dealt with Saddam as an ally - and probably didn't like it.