It is quite absurd to use this case to attack immigration. Most immigrants are not criminals / murderers. Many contribute greatly to their communities, to the economy, to society generally. Whilst I agree that more should be done to ensure that convicted criminals are not allowed to set foot in the country, please don't use this case for political ranting.
So you think it's ok convicted murderers are allowed into the country do you? To murder again! I suppose you have no problem with the literally 100's of Pakistani child grooming gangs specifically targetting underage whitr British girls? You ok with honour killings, female genital mutilation, acid attacks, muslim no go areas, school radicalisation, etc. etc?
Never mind the murder of Lee Rigby, the 7/7 bombings, dozens of foiled terrorist plots, illict drug epidemic, muggings, gun crime, prison overcrowding and violence, NHS at breaking point, housing crisis ..... shall I go on?
Personally I think our soldiers in the world wars wouldn't have bothered if they could see what has happened to their country in the last couple of generations! It's a disgrace!