You can tell this is a gun problem, not just a bad person problem as the gun lobby says, also by comparing non-gun homicides of similar countries as the USA, and then adding guns to the mix: non-gun homicides are slightly on the higher side but within normal range, while gun homicides go wildly higher. If this was a bad person problem at its core, there would be a wildly higher amount of non-gun homicides as well, but that's not the case. Included is an article describing this phenomenon and a link with a picture.
i know thedred and grey have the typical non answers, so i'm curious if anyone else can defend the position that guns don't cause problems and that this is just a bad person problem.
also here is an overview of some issues in gun control science and policy