I'm too impatient to mulitquote everything, but I'll try to hit on some of your concerns and biases.
As for Miranda---it isn't needed. Ignorance of the law is no excuse. Just another dodge for criminals to escape justice.
It may not be needed by you, but it is needed by that dumb schmuck who falls afoul of sloppy or biased police work, and doesn't understand that he has rights, and doesn't have to cede them to anyone wearing a uniform. This is an important aspect of universal freedom and democracy, concepts you claim (correct me if I am wrong) to support.
Intelligence is not a trait that follows ethnic groups. You've been watching Fox News again, haven't you? Some dysfunctional traits can be inherited, but not across the board of a racial group.
To begin with, black people are not snakes, although you may think so. There are multiple and complex reasons why people or social groups act violently. Blacks in the US have a history of slavery, lynchings, and discrimination, which no doubt goes into the mix. But these are social, psychological, and economic problems, not ones of race. Your own president is black. He is also a professor of law, and an articulate speaker. Are you going to tell us the white DNA in his system overcame the inferior black DNA?
Up until the '60s, in the US south "white" violence was over the top, with blacks being lynched just for fun, and on some occasions white activists were killed too, for having the nerve to suggest human rights had a place here. Are you going to tell us this was just traits within the white southerners DNA, or, where the reasons here more complex?
As for Africa- you're right. It is a mess. And so is Central America, Russia, Brazil, and a number of other places. The reasons for this could fill a book. The simplistic answer is to guess that if these folks look different, then they are different. Doing some background reading will disabuse you of this idea.
Implicit in your statement is the idea that if someone kills themselves, then it is of no account- write them off. A death is a death, and if it can be prevented, that's generally good. This is the point. Are you aware, by the way, that a great many US military vets have killed themselves? Do you figure they count, or not?
Nearly one percent of the US population is incarcerated. That's massively higher than any comparible country.
You have made the classic error in interpreting statistics. Because two events are correlated, it does not necessarily imply cause. I get up and shave every morning, and every morning the sun comes up. Using your logic, I could say my shaving causes the sun to come up. Get the picture?
Yep. But gun deaths per captia are far higher in Switzerland. We can guess the reason.
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One last thing to chew on. Would you feel more threatened in a gun collector's house with a hundred guns well supervised, or in a crack house with ten crackheads and just one stolen handgun?
I feel much more secure where I am, in a country where violence is downplayed, and gun ownership severly restricted.