Any statistic that uses "gun deaths; gun homicides; gun related crime; gun accidents; gun suicides dropped....." has to be thrown out, null, and void. Well yes, of course that would drop... duh... if you banned all cars fatal car accidents would sharply drop.
A whole study of all crimes, suicides, homicides in general needs to be correlated with the confiscation, for many years afterward, so that normal fluctuation noise can be accounted for, for that data to mean anything. When that is looked at, the real story is banning guns from lawful citizens does absolutely nothing to make them safer in the big picture. All it does is make criminals (and power hungry politicians) safer, the latter, the main goal of the whole exercise.