It's hard living a black-and-white life inside a world of grays.
What leads an otherwise moral person to murder anyone associated with legal abortions? Easy answers have already been given to justify such acts. Equally easy answers can be summoned to counter any first set of easy answers. Such debates become moral ping-pong. A war of absolutes becomes relatively absurd.
Even Nature's timeless "law of the jungle" has a symphonic logic. In contrast, murder for any higher moral purpose fee