I see two possible explanations:
1. A far right wing extremist decided to try and bomb a bunch of left wing democrats two weeks before the national election, totally oblivious to the fact that the only possible effect it would have would be to fire up democrat voters who would have otherwise stayed home, and by pure luck none of the bombs went off.
2. A far left wing extremist decided to pretend to bomb a bunch of left wing democrats two weeks before the national election in a desperate attempt to fire up democrat voters who would have otherwise stayed home.
Which of the two do you think is more likely?
#2 because of the word “pretend”. These packages were not “bombs”.