UK: why is hate preacher allowed to hold London rally demanding Sharia Law in UK?

This is yet another example of the Governments willingness to acquiesce to Islam regardless of the views of the rest of the population. With each demonstration of their pathetic weakness our Government encourages more and more demands from muslims. This Government is so far out of touch with the opinions of the electorate my only hope is that in future this period of Politics so damaging to our country will ensure Labour are never again elected to Government. As for Islam, muslims should be reminded this is traditionally a Christian country which I for one would not wish to change. If they want sharia there are plenty of muslim countries they can live in if they so choose. I can't imagine any other country being so idiotic as to allow imported religions and cultures to supersede theirs. Hate preachers have no place in this country and should be deported on the grounds of being a threat to public safety.