My idea on why the US is more likely to have mass shootings is quite different than most. I think we have more mass shootings because our law enforcement techniques for regular, small scale murder has gotten so good that small scale murder is easier to prosecute, easier to catch (most are morons), and less publicized. The US is also a place where reporters are everywhere, the news is broadcast worldwide to people who don't even want to hear about it, and that brings out the crazy 15 minutes of fame in people.

The actual act of being so hard on murderers has in my opinion increased the likelihood of mass murder to happen. Because people can't vent out their murderous intent on smaller numbers they have to plan bigger and get more casualties to make the effort worth it.

I'm not saying that we should be softer on murder, just that it is inevitable. Humans want to kill other humans, I think it's in our DNA.

For other countries to say that they don't have people dying of murder on the scale that we have, first you have to look at the wide variety of differences in our country. We are the world's melting pot of opinions, ideas, races, cultures, religions, sexual fantasies, etc, and we have a ton of people. It's just going to happen naturally. We are also larger physically and population wise than <insert example small European country here>.

One thing about our country being a melting pot that nobody addresses is that racial, cultural, and ideological integration to this magnitude is not supposed to be easy, yet everyone just wants the magic iPhone app for cultural integration. It's just an extension of our already rapidly shortening attention spans, since tolerance literally is about duration as much as attention is. Everyone can tolerate their enemies, even ISIS in western society or Nazis among Jews, it's just a matter of how long they can tolerate it. Our attention spans have gotten so short nowadays that our tolerance duration of other people have reduced comparatively.