I'm writing only about my native country of England and what I consider to be its failings according to my own value system: I 'blame' my parents' generation - 'baby boomer' in Harmony's rundown - insofar as theirs was the biggest squandering of potential. Thatcher's infamous "there is no such thing as society" ethos did irreparable damage to the north of England, where I'm from. When a country finds itself in a relatively good situation (as in many ways Britain was in the early 80s), you have to use that as a platform to improve things even more for future generations, rather than just squirrel as much of the good fortune away for yourself, as many did (and the millionarie trust fund children of those who did it now fill the UK parliament: Boris Johnson, Rishie Sunak, Jacob Rees-Mogg etc). My dad - a simple working-class greengrocer - worked very hard but in terms of things like access to 'free' and high-quality (and debt-free!) education, access to a strong NHS, access to affordable housing, and so on, his generation had it far easier than mine. The result now in England is a very divided, very worn-out society whose health and education infrastructure is stretched to breaking point, and where the gap between rich and poor is enormous and increasingly unbridgeable. My parents' generation - fortunate through no effort of their own in so many ways - missed the opportunity to strike a balance between valuing self-sufficiency but also fostering a culture of looking out for one another regardless of wealth, background, accent, etc. With a slight change in values and priorities, so many of the problems England faces today would have been ameliorated. And that's what's sad about it. It didn't need to be a paradigm shift. Just a slight one.
I could write more but it'd involve getting into political ideology (i.e. the British brand of socialism that would have worked - similar to how Scandanavia's 'socialism' more or less works today - had Thatcherism not seen it as akin to Stalinism), but that'd be too close to P/R's war-torn border.
All that aside, I'd like to have been born 30 years earlier, if only to witness first hand as a teenager the rise of my favourite bands and watch movies like Taxi Driver, Mean Streets and The Godfather in the cinema, instead of the reboot of the remake of the re-imagining of Superman vs Iron Man's League of Vengeful Justice Part 9 (couldn't resist a 'bah humbug' wisecrack to end with).