Not parent, but my thoughts:
- Decline of religion/spirituality is more pronounced in usa.
- More dual working parent homes (due to free labor markets). I also suspect that while real incomes have risen, actual disposable income has decreased, which pressures households into dual working arrangements. This means less time invested by parents in kids.
- institutional rot of public education . As some poster said, school bureaucracy is now defacto enabler of bullying - by doing nothing when observed... and punishing teachers that actually try.
- the internet has cracked the authority of social groups, with more time spent online and people more fractured among niche interests. This means less oversight and more activities happening without a concerted response by the group