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Both of those are deceptive comparisons: that page will tell you that China has had 90 fatalities in total since 2010 whereas despite being a third the size we have had 13,500 mass shooting deaths. Similarly, while the Bath bombing killed about a third more people than the deadliest school shooting (only ⅔ of the deadliest mass shooting) the difference is that you had to go back a century for that example whereas the shooting toll for any recent decade is higher.

The common factor is easy access to firearms. Every country has mentally ill people, every country has embittered people who are mad at the world, but only the United States has removed the restrictions on gun access which allow those people to engage in mass shootings. That started in the late 1970s and the contrast with our peers is staggering: Australia has many cultural similarities but they actually value life and tightened their gun control laws after the Port Arthur shooting, while we’ve loosened ours and have hundreds of thousands of more deaths.