I think it's because he's trying that he gets booked. He's trying - but just not quite there yet to make those flawless tackles that Bissouma and Caicedo made (until they left - as now they seem late to most tackles).
We always have to be happy simply not to lose to Palace. It really doesn't matter how terrible they are - they always find a way. After all, they came back from 2-0 against Man City at the weekend.