At least 400, trained and battle hardened former isis fighters are known to have arrived back to the UK, that's a small number relative to the population, but, but just imagine the carnage 400 murderers can cause, not to mention the radicalisation, there are also 3000 on a watch list, the Westminster killer wasn't on it. But yes I agree there are some brilliant, lovely Muslims in our country that just want to live their lives, unfortunately they don't matter.