Because other people don't have this problem. And when you get right down to it, they have megaphones and placards, while their opponents have guns. Amazingly, the gun owners have more political power.
My views on gun ownership are complex and don't fit neatly into existing pigeonholes - I'm very much in favor of the right to own weapons, but also in additional social responsibilities that ought to accompany that. I have a lot of sympathy with the gun control crowd even though I disagree with many of their arguments, but the fact is their tactics are simply not working. Unfortunately they don't want to change their approach because they're so locked into the moral dimension of their argument that they're unwilling to consider any other approach. Likewise the 2nd amendment absolutists are so intransigent that they keep retreating to a hardline position of 'shall not be infringed! shall not be infringed!' and then complaining about how unreasonable their opponents are.