I certainly am not insinuating the government does no wrong, nor do I disagree that ATF and other government agencies have used poor judgement, indiscretions and violated the law at times themselves. But the odds of a law abiding citizen, legally capable of buying, owning and possessing firearms, that buys a legal firearm at a gun show, being the target of a shady sting operation is not reality.
Your "nice guy" Randy Weaver is a prime example. What went down @ Ruby Ridge is certainly proof that mistakes have been made. But Randy was not as pure and innocent as freshly fallen snow either. He was targeted because he had already been implicated and charged with illegal gun sales and openly consorted with members of of what was then determined to be a major domestic terrorist group. Not your average gun show shopper. Folks that have determined that strangers are "nice guys" after "brief conversations" with them, many times end up their "victims". If I had to choose between having a ATF agent or a Skinhead Nazi living next door to me, the choice would be clear. How about you?
This. Do shady dealings or push the envelope of what's legal and what's not and you make you own destiny. Think that going to a gun show and by simply making a legal purchase makes you a target of a major sting operation is either paranoia or conceit.