*sigh*
No, appealing to popularity is not a good thing when you're trying to advocate an idea. Logical fallacies are things to be avoided.
Maybe it's because I go outside of the gun community, online and IRL quite frequently, to do RKBA advocacy, that I see the potential for deleterious effects. When I have to face antis, or even more importantly, swing voters in the audience, negative stereotypes are something you absolutely do NOT want to play into. Also, tying together two contentious issues, one of which is much nastier to deal with than the other, does not help at all, EVER. The only people who posters like this appeal to don't need any convincing; you've already got their vote. HOWEVER, there are plenty of people out there who haven't made up their minds. Playing into stereotypes, and tying together multiple hotly contentious issues is always a BAD idea if you're trying to win a debate and forward an idea, but it's always a great tactic if you're trying to confuse people, stall an idea, or kill a debate. I've had it tried on me many many many times and it always makes me do ten times more work to get the RKBA message across when someone successfully introduces the "bible-beating, gun-loving redneck" stereotype into an argument.
So, the point I'm trying to make, which some unfortunately seem unable or unwilling to grasp, is that, while I know your intentions are good, that you are apparently unaware of just how much DAMAGE your picture can do when let loose onto the population at large.