Why wouldn't teams join the MPCC?
Look at it another way: why would they?
If a club to promote clean cycling allows a team to join even while it's being run by an unapologetic doper and under threat of losing its UCI licence due to doping violations, what does that say about the club's 'credibility'?
To be fair, though, I do see Dumoulin's victory as a positive sign for the credibility of the sport. He is, as far as I know, entirely untainted by suspicion.
I had no idea about the team with the doping boss (which one?).
From the outside it looks like a shining light of purity and to not join begs the question 'what are you hiding?'
Shades of Jonathan Aitken!Shining light of purity?
And the comments show that he's probably not alone and not entirely vilified.68 year-old caught for the second time: http://road.cc/content/news/224019-68-year-old-canadian-cyclist-caught-doping-again
Does being paid $20,000 a year to race at that age make it worth doping?