We have a similar group in the UK called the EDL (English Defence League). There's a lot of parallels between the two groups. Even if these groups have valid criticisms of Islam as an ideology, they're infested with right wing elements who do harbour prejudiced and bigoted views. They cause a lot of fear mongering with their exaggerated claims of the "Islamisation of the West". Fortunately the majority of people can see through this. The counter demonstrators against the EDL have had much higher numbers. We have sharia courts in the UK, they have next to no legal jurisdiction at all, but are respected within Muslim communities. It is an individual's choice if they want to resolve their disputes in this sharia courts. They only have legal jurisdiction if both parties agree on the court being their arbitrator. This however doesn't prevent individuals from being pressured from within their community to use sharia courts. They can be demonstrated to have a positive effect, but also to cause harm to those that chose to live by it. And let's not forget Western legal systems are not perfect themselves. It's a very complex issue and an interesting topic for debate.