Why should he have to cite where he gets his information? It's his opinions, after being on the scene for a week and a half, observing the case and the characters in person. He has more insight than most of us do, because he was there... we were not. He may have seen and heard a great deal more than we will ever know or hear about.
As to your statement that those who like him should give reasons why other than "because he cares", I think the same rule should be applied to those who hate the Anthonys and accuse them of things they only speculate about, based on nothing beyond the fact that they've been in the media spotlight so often, and Cindy "talks too much." Both are equally as ridiculous.
I have already stated that I don't believe everything he says... but that doesn't keep me from liking and respecting him. My feeling is that in his line of work, he has learned a lot about people in general, just by doing what he does. Whether he is in it for publicity, or to make money, or whether he can actually help bring this case to a close... I don't know. But I do know that several people who have actually spoken to him all say that he is kind, generous, and very, very honest. He doesn't hide behind anyone or anything. He is who he is, and he doesn't apologize for it. For that... he gets my respect.