I don't think it is OK, because they are using it as a front to push their oppressive stance.
I don't either - I've been quite clear that while I believe speaking out against Islamists is perfectly fine using it as a cover for outright racism isn't on at all
I don't believe that they should be able to oppress a whole people because of their beliefs.
I'm not sure how they are oppressing a whole people per say - while some of them may privately want to oppress Muslims they're not a major political party and they've not got the power to do much more than simply march and be vocal... There are obviously isolated acts of vandalism, graffiti etc.. carried out in their name which again highlights the obvious far right racist element of the group. There is nothing inherently wrong with marching, speaking out against an ideology.