Because the rich want to distract us from the real class war by redirecting anger at old people.

Part of it is just demographics and survivorship bias. The majority of boomers who are still around are the ones who didn't have to break their bodies to make a living. The average age of billionaires, senators, and CEO are all in their late 60s, so it's easy to look at the group and wonder what the hell is wrong with the generation.

were tricked by the rich to give it all up so they're kids wouldn't have it

I think to accept this as the answer it requires a plastering of cognitive dissonance. The rich themselves are old, they are from the same generation and are the people who voted for trickle down economics and empowered neo conservative policy. I don't think this generation was tricked, moreso I think they were bribed and were happy to prioritize their own wellbeing over others.

because most of them have brain damage from lead in fuel.

This is mostly an artifact of pop science. GenX is actually the generation that was exposed to the highest levels of lead. I think a more important explanation of why boomers are the way they are is simply socioeconomics. They were really the first generation to be fully reared by modernity and the age of the atomic family. Where family units moved away from their extended families to pursue better economic mobility. Meaning instead of being raised by a community of family, they were often raised by an isolated mother, and a father afflicted by suppressed PTSD from war.