I prioritised the flow of the sentence ;) Top 5 currently are red/white, and then adding the ones at the bottom of the table (Almere, Utrecht en Ajax) you have 8 out of 18.

Instead of stopping all professional football in the Netherlands, stop all those games with teams that repetitively cause problems. There is definitely too many games with issues, but not the majority of them. Then again, Van Basten, probably has his red/white glasses on again, and sees Ajax as the epicentre of Dutch football.