Ah yes a very difficult discussion. When I was in Criminal justice we talked about how DNA evidence saved many innocent lives from deathrow and have taken innocent lives out of prison. It sucks too for them because the state/fed wont cover them for damages, if you want money you will have to sue the state/gov for false imprisonment. So in todays world people aren't executed as much unless it is Texas.
Now looks look at Europe as a whole. I don't know much about how peoples lives go in these countries except for what the media likes to say or what I read on youtube comments. Anyway before I move onto europe lets take a look at the US. Europeans describe Americans as violent fat people who take oil, probably soom truth in that. I don't see news of gang shootings or school shootings. Anyway according to the media violence is common in the US and Mexico and Europe seems to be fine place to live. Here in the US and Mexico you street gangs, organized crime groups, and drug cartels to the south. The gang culture is one of the most glorified things in youth. You hear mainstream rap songs about killing cops and loving bitches, you see kids wearing red or blue shirts, baseball caps, bandanas, tagging fences, and using firearms in the stupidest of ways. In california you have the Nortenos(red) who live north, and in the south you have Surenos(blue). These guys shoot at each other everyday, everyhour, everyminute. So we have people ages 14 to 21 killing each other in gang shootings. Now in the European countries I don't hear news of kids and young adults killing each other. I don't see news of overcrowding prisons or executions over there. What are we doing wrong? Do we outlaw capital punishment and hope our prisons dont overcrowd, or do we seek at the source of the violence and violate the 1st amendment to eliminate it? Outlaw the gang attire and rap, or outlaw the death penalty and watch our prisons overfill with prisoners.

Also each state varies from one another, but for right now California will be my example because California has the highest population in the nation. Also for those you who aren't familiar with gang culture, those Nortenos or Surenos don't care if kids or innocent lives are caught in the crossfire. They don't care if their rival is a fourteen years old or twentyone, they are at war and will continue to shoot eachother. Also if you think outlawing fire arms from peoples hand, then good luck. Most of their weapons are either stolen, smuggled in from Mexico, or have had the serial number removed.