I have seen this: What’s the block reward for smart contract miners? Which addresses it for the POW period of Ethereum, but what about POS? They just earn a sort of "interest" for their stake as staking rewards, so why can't they just ignore all of the smart contracts?
I also saw this: How do miners profit post-PoS, if at all, how will new miners get their start, and who will execute the EVM byte code (and why)? but it doesn't say why the miners don't ignore it.