RosieLeah I take your point about the laxity regarding gun laws and border controls and agree that we need to find ways, globally, of keeping better records.
However, as the (foster) parent of young male refugees and the friend of some young male asylum seekers it actually hurts me to read posts that single them out as 'suspect' people. The implied threat from a tiny minority really should not prejudice us against whole people groups who have possibly endured horrors far worse than you or I would wish to imagine.
One of my asylum seeker friends is living in a hostel filled with British men and he is terrified by their behaviour. He has observed first-hand, in London; shootings, stabbings, police helicopter chases, street brawls, drunkenness and drug taking. He once called the police when he saw an attack occurring and subsequently had to be moved, under police protection, to another hostel for fear of reprisals. This is a young man who has suffered torture and seen his father and siblings killed in front of him. He knows that the people he is living among don't represent the majority of the British public, I just wish that others would afford him the same courtesy.