No motive. He's a psychopathic killer acting without reason. Hard to believe that these weapons were purchased legally. The 2nd amendment was created with the mindset that we have the right to bear arms for protection, and I support that. Citizens are just abusing the 2nd amendment, buying them to murder, rather than protect. I would be 100% behind eliminating all gun ownership if it guaranteed that no guns were out there. Obviously that's impossible. The psychos who end up with these guns will get them one way or another, whether legal or not. Firstly, internet access to purchasing guns, ammo, etc. needs to be illegal. Secondly, the purchasing of a weapon needs to be a long, tedious process. Background checks, psychiatric evaluations, etc need to happen. They may happen to an extent, but they need to be much more precise.