We have a little thing called due process...which means that we can't just start preemptively locking people up if they haven't been convicted of a crime yet. In the case of many of the types of people who commit mass shootings, it's their first violent crime.
Unless you're suggesting that you're okay with red flag laws? (IE: if a school counselor says they noticed violent tendencies in a student when they were teen, we disqualify them from future purchases)
Laws like that tend to only be effective pre-proliferation.
Which is why I'm not in favor of people proposing Chicago-style gun laws, as the effect will be very little once guns are already on the streets.
And it's fair to point out that gun laws are only as effective as the neighboring gun laws. For instance, one of the highest sources of guns recovered at crime scenes was a place called Westforth Sports in Gary Indiana.
I wouldn't expect strict gun laws to have much impact if lax gun laws are only a quarter tank of gas away
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Do you have any facts and figures about that?
Recidivism is certainly a problem, and I'm aware many who engage in some violent crimes often reengage in them upon release...but short of issuing a life sentence for every violent crime (which paints a wide brush), not sure how one would propose addressing that aspect.
For instance, a guy who goes into a convenient store, punches the clerk, and steals a bunch of stuff has engaged in a violent crime, but I don't know that we can start issuing life sentences for that.
Other nations also have a very different prison culture than we have with a greater focus on rehabilitation over punishment. Many here in the US who want to get "tough on crime" would probably turn their nose up at the Norwegian prison system.