I guess it will be quite much harder after tomorrow...
The world is full of sick people. What's bad is that people like that are the reason the rest of us need guns to protect ourselves. We might have a nut like that shooting up our neighborhood. If the law prevents us from owning guns then only the bad guy will have one.
I know people think that if we got rid of all guns we wouldn't have to worry about someone else having one. But that is just never going to happen. Who's going to cover every inch of space in a country to make sure there are no guns there? And what about people smart enough to build their own guns? When he was 11 or 12 my son built an air rifle that would easily kill someone. It took about $5 worth of parts and some glue and a cheap air compressor. Once it was pumped up it could be carried around for a long time before it had to be fired or pumped up again. With an air tank that was big enough it could have fired dozens of times.