The US has a pretty large population, about 4x the population of Germany, 5x the population of England, 12x the population of Australia, and about 50x the population of Ireland, etc. By that virtue alone we are going to have more mass shootings. I don't have the statistics for China or India's mass shootings, but those would be more fair to compare in the shear numbers department.

I definitely think our gun laws are stupid, I would support legislation to curtail or completely eliminate guns, but it's not like the US just has one generic kind of person; a big and diverse population is going to bring a lot of really cool and awesome people (many of whom move to big cities like NY or Chicago, which is why I like the US), but also a bunch of xenophobic idiots that also really like guns.