For the majority of this nation's short history we've had greater restrictions on who could vote than what we have now. Call the current "everyone votes" period a failed experiment.
We still have restrictions, relating to age, criminal history, etc.
Advocating for additional restrictions isn't the same as not believing in America. It's a matter of degree.
Otherwise I could tell you you don't believe in America where everyone is equal if you don't think people should be able to vote before 18 also. This little game of acting like total, unthinking, limitless equality is always smart or the ultimate measure of a person's worth is whether they advocate that or not, is stupid and childish.
In 2012 we like very much to think that all the generations prior to our own were stupid, and laboring under a laundry list of prejudices, ignorant views, fears, and that we can reject all the wisdom of our grandfathers and great grandfathers because we've got it figured out. They were more in agreement with notions that had held sway for thousands of years than we are now... so it's easy to just associate the entire past and lump it all together.
Discard it as just a bunch of ignorance. I did that, for a long time.
I feel, however, that we are now seeing a crumbling of society which demonstrates that in SOME THINGS (I wouldn't want to revert completely) our forefathers had more wisdom than we gave them credit for.