Levels, not rates. Rates are largely about the police trying to look good in numbers. It is seriously difficult to quantify these things properly.
There are victimization surveys that verify lower crime levels apart from amount of crime that the police deals with.
We can discuss whether it's lead or the new clever crime fighting techniques that's the cause for lower violence but the expert consensus on the subject is that crime is down just as the expert consensus on global warming is that temperatures are up.
but yet it affects middle-class people far more, from their angle of life experience life got more dangerous.
How do you know?
Formality is a way to avoid the kind of offense that gets retaliated physically
But it's not the only way. I rather have a culture where people hug each other, are nice to each other and also openly speak about their concerns when that makes other people uncomfortable.
It might be that you personally prefer formality but other people don't. Don't project your desire for formality onto other people. It's a right wing value and right wing values lost ;) Right wing values losing is no reason why an idealistic youth should be pessimistic.
A few notes about the site mechanics
A few notes about the community
If English is not your first language, don't let that make you afraid to post or comment. You can get English help on Discussion- or Main-level posts by sending a PM to one of the following users (use the "send message" link on the upper right of their user page). Either put the text of the post in the PM, or just say that you'd like English help and you'll get a response with an email address.
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A note for theists: you will find the Less Wrong community to be predominantly atheist, though not completely so, and most of us are genuinely respectful of religious people who keep the usual community norms. It's worth saying that we might think religion is off-topic in some places where you think it's on-topic, so be thoughtful about where and how you start explicitly talking about it; some of us are happy to talk about religion, some of us aren't interested. Bear in mind that many of us really, truly have given full consideration to theistic claims and found them to be false, so starting with the most common arguments is pretty likely just to annoy people. Anyhow, it's absolutely OK to mention that you're religious in your welcome post and to invite a discussion there.
A list of some posts that are pretty awesome
I recommend the major sequences to everybody, but I realize how daunting they look at first. So for purposes of immediate gratification, the following posts are particularly interesting/illuminating/provocative and don't require any previous reading:
More suggestions are welcome! Or just check out the top-rated posts from the history of Less Wrong. Most posts at +50 or more are well worth your time.
Welcome to Less Wrong, and we look forward to hearing from you throughout the site!
Once a post gets over 500 comments, the site stops showing them all by default. If this post has 500 comments and you have 20 karma, please do start the next welcome post; a new post is a good perennial way to encourage newcomers and lurkers to introduce themselves. (Step-by-step, foolproof instructions here; takes <180seconds.)
If there's anything I should add or update on this post (especially broken links), please send me a private message—I may not notice a comment on the post.
Finally, a big thank you to everyone that helped write this post via its predecessors!