Putting a wall around London wouldn't help
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England is screwed. They can't even put a wall around London to keep terrorists out, because London is already inundated with terrorists. If you have ever been there.. you know that the place is swarming with muslims. Even the mayor of London is Sadiq Khan.. whose words of wisdom after the attack were to tell the citizens not to be alarmed!
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The UK is completely screwed. The terrorists, for the most part, are home grown.
Social media plays a huge part in the problem, because they aren't too concerned about removing anti west propaganda. You can find videos of ISIS beheadings all over social media, white at the same time they are banning conservative voices for "wrong think".
Oddly, but not surprisingly, it's leftist billionaires who live in their own cocoon, telling us that we have to love everyone except conservatives.