This thread does feel something like a cop bash. It's a bit ridiculous to assume that most cops are anti-gun, though I suppose it isn't fair to say that they're all pro-gun, either.
Police officers represent a reasonable cross-section of our society. Some are highly educated, some have GEDs. Some are nice guys, some are A-holes. Some work harder than you could imagine, some hardly work at all (it would seem). Some like guns, some hate guns. Most are ethical and do what they are supposed to do, a few screw up either because of the fact that they are a bad apple, or simply made a mistake. As we all know, the screw-ups get the attention.
I'm a cop. You guys can decide for yourselves whether you think I'm pro-gun or not. I have well over 1,000 posts on this forum that you can dissect all you want, if you need help deciding where I stand. I also know that three or four guys from my agency (that I'm aware of) also post on here, though I won't be the one to identify who they are.
Would cops go door-to-door collecting guns if they were banned tomorrow? I sincerely doubt it. We don't even do that for drugs now, and how many decades have they been illegal? Frankly, I doubt that the feared door-to-door gun grabs would ever happen at all. It would take a HUGE shift in the way we do things in this country before such an event would/could happen, and I doubt most of today's law enforcement officers would still be in their positions if it came to that. I know I wouldn't be, and the same can be said for many (but not all) of my coworkers.
I do believe that the 2nd Amendment was written to keep our government in check, and to keep the power with the people. I'm not ruling out the idea that something like this could happen, if our government started a power grab against the citizens, and changed from its current form. But, it's not going to happen right now, and it's not going to happen unless our government restructures itself greatly from the way it is operating today.
By the way, I consider the New Orleans example to be a poor one. First, that department already had an established reputation for corruption. They didn't hire good officers, and they didn't screen them well. Frankly, how could they? New Orleans was paying just over minimum wage at the time that Katrina happened. I can tell you right now that I wouldn't be doing this job for those wages! It's hard to attract good applicants when you don't entice them to the position with favorable salary/benefits, and when you rule out the possibility of hiring the best candidates, you sometimes end up stuck with undesirable candidates.
I recently had lunch with a New Orleans Commander, following a funeral that they attended for a fallen officer here in Colorado. They spoke about the corruption and problems they had in New Orleans, and I believe that many of these problems have already been addressed.
Anyway, the long and short of this post is that I don't think you guys should look at law enforcement as an enemy of gun rights. And, I also don't think you should look at associations for Chief's of Police as the best organizations to speak for the line officers. I'm a grunt, and I'm also not a member of any one of those organizations.