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> edit: for an example. you get hacked and lose $100M. You say fuck it, submit a slasher report that says it wasn't a valid transaction. you offer enough money to get x% of validators to agree with you.

That's not what slashing is supposed to be used for, but if that situation happened again, Ethereum would fork again, just as last time when Ethereum classic didn't agree to freeze the Ether from the DAO hack. PoS makes it a little easier to fork (which is good imo), but doesn't change anything fundamental. Everyone still needs to be in complete agreement about the rules and history for Ethereum to work.