Because you'd be punishing millions of innocent refugees who lets not forget are refugees mostly due to USA/UK meddling in the region in the first place.... who will just become angry and hateful towards the UK/EU in general if we refuse to help them.
Don't want the responsibility for consequences of our actions in the middle east.... stop ******* around there.
Terrorists can get in anyway. Refugees want to come here to LIVE, a holiday won't cut it, terrorists don't want to live here. They will happily have someone in country murder people to steal passports or whatever else. Terrorists will make it in regardless, refugees shouldn't be punished because people are too naive to realise this.
Plenty of terrorists, foreign and home grown, were already in France and the UK before the refugees were allowed in.
You may as well shut down all hospitals and stop providing medical care after one psycho getting treatment kills a doctor... who cares that almost everyone else is absolutely no threat to doctors, it shouldn't be easy to get into hospitals because of this one incident.