That timeline leaves out the bombs around Coeur d'Alene.

https://www.upi.com/Archives/1987/10/01/Coeur-dAlene-bombing...

I specifically remember my dad talking to his parents about that one on the phone and being scared for them.

Like my other comment below though, part of the reason they resorted to violence is because at that time, they had no hope of participating in mainstream, electoral politics.