I Hate Seeing Shootings Happen At Schools

I am a bit aghast at the people calling for the repeal of the 2nd amendment based on the school shooting in Florida. According to reports the law enforcement failed to act on at least 8 separate times when they were told that the shooter was a threat. Now if the law enforcement won't act on clear threats how would they ever enforce the gun ban following the repeal of the 2nd?