JIt doesn't matter how much money would come flowing into our pockets, we'd take the ethical high road, wouldn't we? Even if it meant we'd be foregoing enormous profits, nobody could convince US to compromise our integrity!! Right?
Irrelevant. The simple fact is that he has compromised his integrity. Whether someone else might do the same if put in a similar situation has nothing to do with it. Let's drop the Godwin here - a large part of the Nazis' success was due to the German people being willing to spy on and inform on their neighbours. These were just ordinary people going about ordinary lives, yet a huge number of them were complicit in horrific crimes and genocide. Would we do the same if put in the same situation? I like to think I wouldn't and no doubt most people are the same. But let's not kid ourselves, we're no different from those ordinary German people, and the majority absolutely would do the same as they did.
But that doesn't make it any better. What they did was still wrong, and it's perfectly acceptable for us point out exactly was wrong and why it was wrong. That we might not be any better if put in the same situation does not make such criticisms any less valid. Oz may not be quite at the level of murdering millions of people based solely on their ethnicity, but the principle is exactly the same. What he does is wrong, and what he does is very much his own choice. That other people might make the same choice in the same situation does not make it any less wrong.
Of course, as Lucian notes it seems that his questionable ethics and beliefs may have rather less to do with TV than you are claiming anyway. He practices woo, he's married to a woo, and he's involved in some very questionable marketing practice. Spouting woo on TV hardly seems like a big step from there.