I don't know maybe they know full auto is not effective for hitting a target. I see no connection with this and your supposed indictment of the firearms community from which you separate yourself. Are you saying you don't own firearms or everyone else is to blame but not you?
The closest event to this is perhaps the North Hollywood bank robbery and with the amount of ammo they expended on full auto they did not get a very good hit to rounds fired ratio.
Since you support universal background checks maybe you can explain why those have never stopped a mass shooting.