You aren't worried about the "why?" I literally busted out laughing when I read that idiocy. You just proved that you are incapable of rational thought. How do you resolve a problem if you don't know why it occurs?
Because the how is more important. If it was ONLY Islamic extremism causing mass shootings, you might have a point. But Merser, cho, Lanza, Loughner, Holmes - not a one ofthese guys was a muslim. They were all able to get guns, just like Hasan and Mateen.
Now you're quibbling about irrelevant details. Your theory was that if a president praised a group of people that he was responsible for every single thing any individual member of that group does. Now you're saying that isn't true. It depends on the details - unless they happen to be a Republican you want to slander, of course.
Once again, you only prove that you're an idiot.
Reagan didn't just "praise" them. He armed them, equipped them, provided them with intelligence, created a whole network of funding, and kept doing so even when Gorbachev begged him to stop. Because they were "Freedom Fighters" when they were killing Russians. They became "Terrorists" when they started killing Americans.