yes, you have to get to root causes before you can fix problems, but that's not an argument against the use of force, it's an explanation of when it's useful and when it isn't.

arguing for root causes as a means of pacifism is a co-option of socialism by religious groups. anybody that's actually read any kind of socialist literature at all will tell you of the importance of violent overthrow in the model.

it's a question of restricting the use of force to scenarios where doing so is productive and can lead to a substantive outcome. for that reason, blowing up senegal would be pointless, whereas very careful support for the revolutionary forces in iran could actually be decisive.

but, it's not some kind of moral issue. it's a tactical question.