That seems a bit pedantic. This bomber mailed 8 packages(it could be 1 person who mailed them all at the same time).
The baseball shooter shot at 24 people, hitting 6 and killing 1 and firing 70 shots.
I would still count all of these bombs as a single event. Particularly since it seems likely that they were all from 1 person. I get that the delivery of the attack is a bit apples to oranges, but they were both horrible acts of violence.
I absolutely don’t think that the congressional shooting pales in comparison to this bombing attack. They are both grotesque partisan attacks.
As far as violence since the 1980s, I would tend to agree. However, the closest parallels are the Congressional shooting and the attack on Gabby Gifford. Gabriel Gifford was attacked by a person without political affiliation. So, in recent memory, this seems to be perpetrated by both sides.
