Ridicule... that would be my weapon of choice. Ridicule and laughter.
This particularly small group of madmen with beards must be delighted with the seriousness with which the media and the powers of government have taken them...

Not only do they look almost as stupid as a bunch of Hasidic Jews mumbling at a wall - with those uniformly bad beards and finger wagging habits - they manage to hold up signs saying...

"Freedom can go to Hell"...

(I almost pissed myself when I saw it on the news)
I just love the comic potential here!
Can we not give them what they want? by the simple expedient of deporting them, in such a way that inevitably they get to be in a prison in the most oppressive regime in any Muslim country...?
This time they really did ask for it.

The real culprit of all the fuss here is the media - there were about fifteen idiotic Islam4UK demonstrators at that "silly-soldiers-coming-home" parade in Luton, but the media played it up as if a thousand or more had just said something important.
They gave it more air time, and more again now, than they ever did to the million people marching against the Iraq war (but who were not stupid beardies but normal law abiding folk of all ages and backgrounds).

The media have got people in the USA and UK believing that our Islamic population is all over us like a rash, and are all like this tiny group of loonies with their desire, but complete lack of power, to trample over our rights and freedoms and take us back to a pre-civilised age (like in Yemen).

If it was someone like this guy (right) leading a group of hardened mafiosi bent on taking over the UK and raping our children, I'd be worried.. I could hear their laughter and sense their seriousness. But people who spend their days reading the Koran, getting sad about lack of virgin availability, and end up wagging their fingers like scared teenagers, with sad little signs saying "Islam will take over the world - Freedom can go to hell"
...they do not worry me.