Yes, but most of these mass casualty events aren't caused with handguns.
Yes... They are...
https://www.statista.com/476409/mass-shootings-in-the-us-by-weapon-types-used/
You cant just make up a definition of "mass shooting" when mass shooting is defined already. Bit like mod team defining what words mean here funnily enough. How someone can be called a "nut" for example provided they are anti a certain orange person