The problem I have with this is I can only think of 1-2 tackles each from Cash, McGinn or Luiz that were yellow card worthy and I can't think of any games where any of them were giving away fouls regularly. Most of the bookings, in my opinion, have been because we're competitive and referees are just a bit too happy to go to the pocket if you press and niggle like we do despite us rarely committing dangerous fouls.
McGinn has been very unlucky, he only committed 16 fouls all season and has got 5 yellow cards from it compared to, for example, Hojbjerg who has 4 yellows from 40 fouls or Soucek with 3 from 38. Cash is similar to McGinn, 5 yellow cards for 23 fouls. Targett is probably the worst though, 4 yellows cards having conceded 11 free kicks all season.
The number of bookings makes us look a much dirtier team than we really are and mean we've had a rough time time with suspensions that isn't deserved.