“extremist material” "hatred"
I guess, Dave, that you might consider starting with your own backyard ... I mean, UKIP website is hosted in the UK and still up and operational at the time of this writing.
Seriously, though ... you, like a great number of other government officials, are already taking down bits and bobs here and there, so I guess that if you can take down a site when RIAA kindly asks, you already can take down Islamist, Zionist, Jehova witness', Mormon, Scientology etc websites ... so what is your point ?