Again, name these nebulous effects that seem to affect you so personally. How does the porn habit of your neighbor affect you? How about the guy across town? Across the state line? Across the nation?
You know what, I want to live in a society without the outsize effect that Texas has on science textbooks throughout the country. I don't always get what I want either. So stop pretending that you moralists are so damn persecuted. At the end of the day, we might just have to agree to disagree, and get on with our own lives.
And really? You're jumping to kiddie porn and nazi comparisons? Congratulations, you've stooped to the same level as those who want to ban gay marriage because, obviously, making that legal will inevitably lead to polygamy, child brides, and bestiality.
We don't outlaw child porn because of its "negative effects on society" -- we outlaw it because of the negative effects on the child. We've decided that minors don't have the capacity to understand the consequences of engaging in that activity and that they are subject to coercion into such acts. If we do not believe the can participate of their own informed free will, then the only other option for production of such material is sexual assault of some form. Therefore, its outlawed. There's also the social stigma aspect, leading to decisions in courts such as that computer-simulated child porn is still, legally, child porn, but at its core it is stigma and *fear* that legalizing it would encourage people to engage in child sexual abuse, but that is not a proven link -- there's little research, and its far from conclusive.
Here's another little something that will blow your mind -- in a handful of states it is legal for 16-year-olds to perform in strip clubs. I don't particularly think that's a good thing either, but there's no evidence that child sexual abuse is any greater in those states, much less any causal link between the two.
As for holocaust, et al, fine, we agree, Nazis = BAD. I encourage you in your crusade against Nazis and naked girl-bits. In America you have the freedom and liberty to voice your opinion, make your case, and possibly influence policy, and all the while you're free to postulate, bitch, and whine about The Bad Thing, and even tell the rest of us what horrible, ignorant people we must be to not see it--But you damn certain don't get to just magic away our exercise of free will and infantilize us all. Under the German regime and the propaganda-induced fervor over ever-simmering anti-semitism, not enough Germans came out an opposed what was going on, or ignored it for fear of retribution or death. I've got a Hitler comparison of my own though--one of the things he did first to grab power and hold influence, was to persecute people for exercising their freedom of speech. When you give those with power the ability to determine what speech is protected, they will invariably use that power to persecute dissent--that is why it's so critical to preserve this freedom in the utmost, even when people use it to express unpopular or negative views. The constitution affirms us many rights, but the right to not be offended is not among them.
If you want things to change, stand in front of a mirror somewhere, give yourself a good BraveHeart speech, and go campaign for change. Battling your points on in internet forum will get you nowhere -- but know that I and millions of other Americans will gladly meet you on the battlefield of public policy, and I'd wager you'll face much longer odds than old William Wallace ever did.