Enoch Powell, unfortunately, died some years ago, but wherever he is he`ll be saying "Told you so!". Remember his "Rivers of blood" speech?
It would be a great shame if ALL our immigrants left - but those who come here and take thousands of pounds in benefits and costing the Health Service dear, and overcrowd our prisons should be expelled. On the other hand, there are many here who form a worthwhile and responsible part of society who are badly let down by the rest. It`s not the race, colour or religion that matters - it`s their willingness (or lack thereof) to conform to the laws and customs of their adopted country.
It`s a sad day that they have at last caused more of our Police to have to be armed. I don`t see that as a "win for the terrorists" though. If that is the qualification of being down a "slippery slope", then America has been down that one for a LONG time! ;-))