I struggle with this all of the time. Having four kids ranging from 18 to 6 (oops!

) it is a challenge to balance trying to impart responsibility and self-sufficiency with providing security and a "quality of life" (i.e. spoiled) we may not have had.
I think the population growth has a lot to do with safety. We live in the same town I was in since 10 years old - has gone from a rural tobacco farming area to large suburb/city. Traffic is crazy compared to then - so the teens driving is a little worrisome. There might be the same ratio of crazies out there, but it does seem that we are either more aware nowadays and those types are more bold/brazen in their attempts. We lost 1 kid to an auto accident when I was in HS, the teenagers have experienced about 6. There have been 3 or 4 abduction attempts at bus stops - none I can remember when I was growing up. There are "gangs" in all the high schools and have been multiple gun incidents - in my day - just some fist fights and "rumbles"
As far as self-reliance, I am convinced we are an entitlement culture nowadays. After 15+ years of coaching kids sports, where you can't teach competition or "correct" mistakes. Your expected to praise lil' Johnny whether he puts forth an effort or not. I dread to think what the poor teachers struggle with. My kids all get good grades and are in advanced curriculum - and they are always loaded with homework -and frustrated - their friends get off the bus with no books and go right out to play - and get essentially the same grades. Try explaining to a 10 yo that their hard work now will pay dividends later. And the teens see things like the bailouts and are smart enough to realize that people can get rewarded for being stupid and lazy - very hard to teach honor, morals, and accountability in the face of that culture.
I have taught both teenagers how to change oil, rotate tires, change brakes, run a chainsaw, circular saw, etc. One "gets it" and is fairly proficient - the other has no interest and has absolutely no aptitude. Both hate physical work. The 18yo bought his first car back in March. I paid cash outright for a 10 year old car - he is making monthly payments @ 4% and the car is still in my name. And he pays his share of insurance. He grumbled at first and still does frequently, but actually thanked me the other day - said he felt good being responsible for it - compared to his friends that get a free ride. (Of course, he could be playing me for something else...

)
My kids are very well behaved and respectful when in public - and the DW and I are pretty strict - at least by most peoples standards - we get funny looks and comments all the time for correcting what most others deem acceptable behavior in kids. But we also spoil them a little too much at times. Like I said - tough balance.
Bottom line - I hope the things we have taught and pounded in these kids are at least sitting there latent in their minds and will be remembered when the need arises - but only time will tell.....