The world today is much statistically safer than 30 years ago, I think only one state has a law regarding kids staying alone. My dd16 and dd14 stayed in a hotel in Philadelphia alone for two nights in November, with other families next door (I had a medical emergency, they had a dance competition).
I agree. I think the world is safer today as well. Doesn't change the laws though.
Currently 3 states have age laws on the books regarding being "home alone." Illinois (14), Maryland (8), and Oregon (10).