Do you think it is normal having firearms?

[Grey Acumen]

I'd hardly put gun ownership at 90%, it's probably in the 50%-80% range, at least after all the various restrictions and the like.
Gun ownership is a right and a responsibility, responsible gun owners who have kids usually DON'T make the gun an off limits item, because then the kid doesn't know how to use it, understand it, or respect the danger that it is capable of.
The best thing to do is start from an early age teaching your kid how to handle a gun and all the rules of safety surrounding them. Of course, one of the hallmarks of responsibility is that you STICK to those safety rules yourself and don't try to show off with your drinking buddies or to impress your kid.

Part of the reason why gun ownership is such an issue is because that basically is insurance that the government is actually working for the citizens rather than itself. After all, if the government decides to do something it shouldn't be doing, what are you going to do to stop it? Sue?
With the type of advancements in weaponry that exist today, basic home firearms really aren't going to do that much, so in many ways, possession of firearms is almost more of a symbol, but it's still an important symbol.