I can agree on some of your points, but definitely not all of them.
The one thing that stands no matter what: if guns weren't so easy to obtain in the US, less kids would have easy access to them. Of course you can build your own or put forth effort to obtain one via illegal means, but kids are probably much less likely to pull either of those things off.
The two pictures you posted above don't have an extreme amount of relevance. The first is a graph showing more relaxed right-to-carry laws over time, and the second is the gun homicide rate only until 2013. That was five years ago. Where is the updated information, and from what source?
All of that aside, your comment and dissection of this topic is much appreciated regardless - thanks.
since then those trend lines have more less continued, the Fergusson effect did cause a spike a few years ago but I expect that to be over when the numbers come out. Kids just text a friend when they need a gun. This shooting was not done by a kid.