I think it’s a combination of decreasing work opportunities for many (low skilled manufacturing etc. have gone), higher expectations (and a sense of entitlement) most of the population now have, combined with a more generous welfare state has led to the current situation. It’s not just the UK either.
Go back 50 years and there were still arseholes but many were employed, they needed to work as welfare was less generous, drinking culture more controlled and less access to drugs.
Unintended consequences of well intentioned policy. There has been an on going belief more support, both financial and emotional, will improve society, doesn’t seem to be working though.