Providing an uncritical lens and an approving audience doesn't encourage someone to change their behavior. Congratulations, we've been shown that the guy is an asshole. He also got a chance to promote his product to people who actually like that product, and arguably given an entire ecosystem that can support him and similar people.

Unless Rogan is secretly operating the world's longest, most elaborate public sting operation, I don't think the "let 'em hang themselves" argument really holds water.