The school massacre in Dunblane was carried out by someone who quite legally owned the guns with which he murdered 16 small children and their teacher.

Strict gun laws don't remove all the risks, but they reduce them in some respects, and don't increase them in any rspect, and it's what the overwhelming majority of people in the UK want. That's good enough for me. Once the people who want to relax the gun laws can persuade most people to agree with them, they can get the law changed again. (But I wouldn't hold my breath if I were them.)