I agree with what you said to a point. In this case, I'm sure he understood the political issues. It's a fairly common occurrence for foreign hunters to go on guided hunts there. Enough to build a lucrative guide service. This company was not desperate and doing anything for money. They advertised themselves as professionals.
Which means nothing. Just look at all the professional photographers on facebook!
It's a far reach to say this man spent $50,000 for this service and didn't take the time to approach as you've described. I'm inclined to believe he did that research on many guide services and decided this one was the best. Yes, this is an assumption made on my part, but an assumption made with some logic.
He may well have done a great deal of research to determine which guide service was the best, but how much research did he do on the actual hunting? I can see only two options: (1) He did all the research and was fully aware of what he was doing, in which case the vilification he is receiving is fully deserved; or (2) he didn't do any, relying solely on the guides, in which case he is equally guilty since ignorance of the law does not relieve one of the requirement to obey it.
I'm also assuming this guide service gave him some assurance that his expectations would be met and didn't follow through on it. I'm still placing my blame on the guide service here. I'd love to see the contract/agreement they had. Might answer a lot of questions.
I would very surprised if that weren't the case, and it's entirely possible (probable more likely) that the guides pushed him to do what he did, playing down any potential concerns, HOWEVER, as the person pulling the trigger, he is ultimately responsible. It would be no different were you and I at a bar, and after several hours of hard drinking, and both being equally drunk, I convinced you to drive your car home. I may bear some culpability, but ultimately, you got behind the wheel, you started the car, and you pulled out onto the public road...