I don't know if you meant this as a serious or rhetorical question, but it is a serious question.
In hindsight, the Civil War should not have been waged since the institution of slavery could have been eliminated through peaceful means, as in England. The number of soldiers who died in the war was probably far greater than the number of slaves that probably would have died under slavery.
Just War theory demands that force be used only when non-violent means will not suffice.
A literal war against abortion at this point probably would not meet this criterion. A second principle of just war requires that the use of force have a reasonable likelihood of success. It is doubtful whether a literal war against abortion would meet this criterion either. Finally, non-combatants should be immune from deliberate attack. This also would also be difficult to accomplish.
A very reasoned and excellent response. You made several very good points.
I just get very frustrated with terms such as "baby killing" and "murder" and "studies" with an obvious prior agenda. That stuff just indulges the "righteous"; turns off the majority and makes the situation worse.