For once I agree with you 100% nuclear1 and I'm as liberal as they come.
Liberal, conservative, it doesn't really mean anything. This is a common sense issue, and everyone regardless of what side of the aisle they're on should see this as a step in the right direction.
But glad to know we both see eye-to-eye on something for once.

I'll get the insect screens up for the swarms of locusts anyway.

Despite all the inconveniences weighed on adults the children can still get guns, smokes, booze, porn, drugs, etc...
Adding another hurdle to a stores operations wont change that. What it will do is waste peoples time (and eventually
of money) solving the wrong end of a problem.
True, it won't stop it, but it is one nasty discouragement. I mean, look, if a kid has to go through the trouble to get a fake ID or otherwise convince somebody of the right age to break the law and get the thing for them, why bother? Most kids at that age just want to screw around; if it turns out to be more trouble that it could be worth, then there's the discouragement. The guns thing is an entirely different category, but that's another discussion for another time.
The kids we have to look out for are the ones that will do just that: go to any extreme to get it. That's where parents have to be responsible and lay down the law at home. Which is, of course, where I agree with you on this issue: parents have to be parents.
id rather my kids (not that i ever intend to produce any more humans) see something like saving private ryan, where they can see the blood, guts, pain and suffering that comes as the consequence of war, than a movie such as (insert name of generic action flick here) where bullets kill instantly, you dont see any blood, and the gun weilding good guys are portrayed as heroes for gunning down all the bad guys. the idea is you want those kids to come out of the movie thinking "violence sucks" and not "that was cool".
Interesting, because I 100% agree with you Nuke. There's a difference between SPR/Platoon and XXX/genericactionflick#49591: the exact reasons you just stated. Still, I don't know if I'd want my kids watching SPR at age 10 or so; maybe wait a few years (14/15 or so), then let them have a go at it. Just my own personal experiences working on that, I guess.
