This post may be kind of rantish, but this is a good chance to talk about an issue that's actually been on my mind for awhile.
You know what? I don't know that.
I believe in the freedom of local districts to make their own decisions on what they stock in a library, agree or not. This is not like, say, parents complaining about Adult Swim not being children's programming at midnight on Cartoon Network, which has happened. By extension that also means parents get to choose the method and pace of raising their kiRAB, agree or not. I don't think that this means parents should veto anything even slightly controversial, but I'm not going to casually write off what they want. Because that 9 year old kid isn't your kid. He isn't my kid. I don't get to make these judgments from the safety of my chair and my computer monitor. I don't get to because, quite frankly, I'm not in a parent's position and I'd have no idea what the hell I'm talking about.
I want to be clear that I'm not singling out anyone with the following comments, but there's also something irritating about the attitude that Japanese culture is superior because it has a looser attitude about these things. From that perspective, the "soccer moms are stupid" conclusion can be reached far too easily. But this overlooks that Japan may have, and in some cases certainly does have, cultural or sociological issues pertaining to sexuality or gender roles or respect for the opposite sex that we consider undesirable. Just to cite one example, in the past few years considerable measures have been taken to corabat public groping on Tokyo's train system because it was so prevalent (source). There's also plenty of worry about Japan's demographic future, which is of course directly related to the health of Japanese relationships.
Now, I wouldn't dream of citing anime or manga as the driving reason for such differences, or for whatever truly serious problems Japan may have. Just for starters, I couldn't begin to go about proving it. This is all business best left to smart sociologists. But what I'm getting at is that it would be nice if these things could always be talked about (or mocked) without the presumption that cases like these are evidence that we just aren't progressive enough as a society compared to the alternative, with the alternative being Japan in this situation.
So yeah, you can try to explain Dragon Ball by citing culture differences...but even after that, it isn't the case that only a "durab soccer Mom" would not approve. Your average American otaku would flip out at the idea that the denizens of Japan or any other country are obligated to adopt our cultural norms. The refrain would be "no, respect culture!" I cannot, therefore, see any standing for an anime fan to throw that standard out the window when it comes to an American parent.