Okay, but how do you know this information beforehand?
You are talking about pre-emptive legislation, I believe. What society should do is give the benefit of the doubt, along with free choice, to its individuals. It shouldn't proactively decide who gets to do what.
As for the former, there are plenty of laws on the books, as well as enforcement of those laws, that suffice. Is it perfect? Heck no. But, if you are a sh*tty parent, your kids will get taken away from you. If you beat your children (and I mean beyond regular punishment stuff) to the point of physical injury, you will go to jail. What do you want? Some sort of eugenically pleasing "parent test" beforehand, with requisite state-endorsed birth control for those who fail it? Who administers this test? What are the questions?
It seems you want to make contingencies for things that
might occur before they happen. If you don't
personally like guns, just say so. If you
personally think they are dangerous and shouldn't be allowed to be owned by private citizens, just say so. But, recognize that those are your
personal beliefs and not necessarily reflective of your neighbor, who also has a right to his or her own beliefs. Just like public prayer. Just like abortion and the debate about when a life actually begins.
And, after you're finished with "Brave New World", go out and rent
Minority Report to watch what is an admittedly non-realistic, futuristic version of what you're essentially advocating. There's also a TV mini-series version of "
Brave New World" (pretty poorly done, if you ask me) that is probably available to rent if you're not into the whole book thing.
-copro