Well, some Dutch muslim youth has become so radicalized and trained in the criminal (robbery, etc) "arts", that they keep popping up in the news for robbery report suspects, that's one thing. There's hardly a white store-or-atm-withdrawer robber in Holland to find.
And I don't and wouldn't vote PVV.nl, I'm a longtime Groenlinks.nl voter, and I don't socialize much with PVV voters because they, while i'm fully white and loyal to my own white-Dutch sub-culture, find me a bit weird often as well, i'm more of an US-american mindset, trying to stay neutral between democratic and republican standpoints, so I really don't know the other reasons for "Wilders' rise to top politician". Nor do I care, really.
I think, you'd best trust the rest of the fair-amount of public political parties in the netherlands, to keep Wilders' party "in check".
And, you may know, I also email all of the political parties in the Netherlands sometimes with (geo-)political tips, and have already politely but briefly and to-the-point, addressed to these political parties of NL, Wilders' overly aggressive policy making towards anti-muslim rules and such, as counter-productive to Wilders' objectives which are primarily to secure a peaceful Dutch state (keep that secure, actually), and that happens to be my own fallback (top-priority) objective / priority-in-this-aspect-of-my-life as well.