As far as his legal culpability, I am assuming that he gave his footage to the ATF as evidence in exchange for his immunity and the sellers are being pursued for violations of the law, if any, that are shown. Generally, it is my impression that law enforcement would rather nab the seller than the many buyers, whether it be drugs, guns, whatever.
But this begs the question, what laws are being broken here? Can someone identify
specific ATF regs that are being violated here? If your seller is not an FFL, are they required to conduct any check? If not, is any crime being committed if you lie to them about your age, residencey, or Brady eligibility?
If his point is that one can buy a gun without ID and he thinks that should be changed, fine. We can debate that. However, at first blush, the video comes dangerously close to suggesting that what happened was illegal under present laws. To the extent that this was intentional, shame on him.
Are the non-FFL sellers stating "No checks, no id, no nothing," touting their genuine exemption from the law, or flaunting their violation of it?
I'm all for enforcing the laws we do have, rather than adopting new ones, and shame on FFL retailers who are not honoring their legal duties and giving the trade a bad name.
I would entertain a rational discussion about requiring a background check on all commercial, not private, sales of firearms, and I think that is what the existing FFL regs are more or less designed to accomplish.
