James Holmes trial (and more about gun control)

For the last couple days James Holmes, the Aurora movie theatre shooter, has been in court. Some details have been exposed in this case that I, and I'm sure many others, had no idea of. It is said in the article on Yahoo News that "In the two months leading up to the Aurora, Colo., movie massacre, suspect James Holmes purchased four handguns and nearly 6,300 rounds of ammunition online and in person" This is a perfect example of why background checks should be mandatory. Also why one shouldn't be able to purchase past, lets say... 100 rounds (preferably less) in a certain amount of time. Like two months. It's amazing, even though American citizens think that it never happens, the US averages 20 mass shootings a year. Think of how much could be avoided if there was just a standard backup check put in place. That everyone had to follow and penalties would be enforced to anyone who thought otherwise. It's just ridiculous to me that things like this don't already exist and we're just now putting these things in place (hopefully, maybe).