The last time we had a bombing campaign here, with many dead, was when some neo-nazi nutcase tried to start a race war. We recognise what happened today as the same thing.
If we're going to catch these guys before they do another one, it's absolutely vital that we have the total cooperation of the UK muslim community, which forms a couple of percent of the population. We aren't going to get that with pogroms.
These guys are either locals, or outsiders with a local running their safe houses. That's how you get them.