And what legislation do you propose that would prevent children from being murdered?

The US has the highest incarceration rate in the World, this may explain much of that trend, but it comes with it's own set of costly issues 

I admit I'm not well-versed on much of the incarceration data for the U.S., so I can't respond with any real degree of knowledge.

a good step in the right direction is fewer guns.. if you have no gun you can't shoot anyone

But there are still plenty of ways to murder people. Mexico has very strict gun laws, yet they also have a murder rate over three times worse than the U.S.

The Second Amendment strikes again.

yeah, but there is only one way to have a school shooting.. guns.. so yeah.. but americans are too f*cking stupid to realize their lovely guns are one part of the issue.

Again, shooting isn't the only way to do physical harm. Mexico has a far worse problem with violence, but it's almost never discussed. Why this particular issue, especially when violence overall, but gun violence as well, is on the decline?

Almost all of the illegal guns used in crime I Mexico are smuggled across the border from the U.S. So again the issue stems from the overabundance of guns in American society.