You are right to say "it seems unfair to blame one generation in particular for the mess we are now in". But the real problem wasn't apathy.
We live in a country where fewer than 1% of any generation get near the levers of power and influence. The author of this book concentrates on such people, but they are not representative of the rest of us. I spent many years trying to help the UK get a better child support system. (I'm childfree - I didn't do it for money or to improve my own condition). What I did is comprehensively documented on my "Child Support Analysis" website. After many years I stopped banging my head against a brick wall and gave up. Individuals can't have much influence unless they are politicians themselves. Lobby groups themselves struggle.
The rest of us can do little but live our lives as best we can without deliberately harming people or thwarting their human rights. What happens to the country is mostly down to external factors (such as the global economy and what the USA decides), or chance, or what a handful of key politicians, typically ministers, decide to do. Obviously there were no conspiracies within the 1945-1955 (or any other) cohort. We were millions of (mostly law-abiding) individuals with lots of different aims and opportunities, not a voting-block with similar objectives.
For the record: only 25% of people in this cohort got to grammar school. The school leaving age was 15 except for the grammar school children where it was 16. Only 5% of this cohort got to university. About 19% of us have since died. Only 80% ever owned their own homes, and that percentage is declining, perhaps as people move into care. Don't judge the cohort by the ones who made the news!