&gt; Ah, they're all just made up. 

The definitions are made up and there is objective evidence of exactly that: ["Three years ago I decided, all by myself, to change the United States' definition of mass shooting"](https://www.reddit.com/r/GunsAreCool/comments/3vd0a8/mark_follman_just_wrote_an_editorial_slamming_us/) -- BillySpeed (creator of massshootingtracker)

Edit: clarity

Edit 2: ...

&gt; I'm sure your definition will really comfort the Americans killed by gun violence

Ah yes. The ever present appeal to emotion.

You still haven't supported your original claim. Nor have you responded at all to the broader picture.