Is tolerance always a virtue?

As an American I am watching these radicals march down streets in London cursing America for bin Laden's death. Whether or not you agree with his assassination is beside the point. Do you think the UK's tolerance from these militants who hate a country which has been DAMN GOOD to them is always a virtue? Do you think Churchill would have allowed these people to march through the streets or would he have had them rounded up and deported? I have many Muslim friends, but don't these radicals who refuse to acculturate need to go? Aren't they even more of a threat to peaceful Muslims to refuse to conform to radical ideologies than native British natives?