mibn2cweus, your 'best' answer (LOL) has put single quotes round the word safety. No threats to the British public you're aware of then?
There will never be an absolute guarantee of 'safety'. But a simple measure of installing locks on cabin doors would have saved us a lot of grief . . . in hindsight. Cavemen with access to technology has always proven to be a bad mix. We will never beat terrorism with more terrorism.