There are many Gun Confiscation people who think that they are somehow guilty for killings at schools. They even think they must do something/anything to stop the shootings at those schools. They were not the shooters, they were not guilty of killing anyone but they feel that they must do something because they failed to do anything before that would have eliminated the killings.
They want to stop the "easy obtainment" of guns. They want to control who buys guns now even though they apparently didn't care enough before, being led by professional gun-grabbers who have been doing this for decades. They now want to get involved because they believe this will suddenly make them Good Americans.