I wouldn't say just post 1970s, but this is why we have a political system based on two sides locked in contention instead of a monarchy or a single ruling party.
The only point I would attack is "the rich get richer, the poor get poorer". The lowest poverty rate in the US was 1989, but it's still tremendously low. Likewise, the lifestyle between your favorite rich celebrity and a middle class family is not as dramatic as it was in like 1850.
It's actually declined the last four years, but it's increased slightly in general since 1989 (we might eventually get lower than that, signs look good as far as I can tell).
But we're talking +/- maybe a max of 2%. Very small changes.
The only point I would attack is "the rich get richer, the poor get poorer". The lowest poverty rate in the US was 1989, but it's still tremendously low. Likewise, the lifestyle between your favorite rich celebrity and a middle class family is not as dramatic as it was in like 1850.