Another Attack Yesterday at Westmister

As you are all aware by the news there's been another attack on our people and country by a known terrorist ... my question is if they are known and apparently there is 1000s living in our country why are they still here ? IF KNOWN TO OUR AUTHORITIES WHY ON EARTH ARE WE HOUSING THEM N SELLING THEM THEIR PARTS FOR MAKING BOMBS OR ALLOWING THEM TO DRIVE WHEN OBVIOUSLY ITS BEING PLANNED TO USE AGAINST US IN SOME WAY !!!! yes some are born here and i'm far from being racist but come on if someone is born here and there's some sort of intel saying they are communicating with the enemy is it now better to take away their British citizen ship and send then to where they belong ... n in my opinion that's not to jail ...surely it could be avoided ... young Lee Rigby killed by 2 known isis followers could of been avoided .... the bomb in Manchester could of been avoided . HOW if u know them ACT ON IT because it will be repeated again and again and again