4 innocent victims, yes, 4 people involved in the illicit activity/targeted individuals - no
mass shooting should be: shooting that takes place anywhere (public space or private property), 3/4+ "innocent"/uninvolved victims have been injured or killed, doesn't matter if shooter(s) is/are alive or dead, the victim body count is all that matters
Agreed. I don't think any of the trackers measure it that way, though.