Martin Luther King Jr. taught important lessons about pascifism. Here’s a statement of principles from the lecture he delivered at the invitation of the Nobel Foundation when he received the Nobel Peace Prize 11 December 1964:
The nonviolent resisters can summarize their message in the following simple terms: we will take direct action against injustice despite the failure of governmental and other official agencies to act first. We will not obey unjust laws or submit to unjust practices. We will do this peacefully, openly, cheerfully because our aim is to persuade. We adopt the means of nonviolence because our end is a community at peace with itself. We will try to persuade with our words, but if our words fail, we will try to persuade with our acts. We will always be willing to talk and seek fair compromise, but we are ready to suffer when necessary and even risk our lives to become witnesses to truth as we see it.
There are many other examples of well-explained concepts one could excerpt from that speech. This one, although it has a twist at the end with which I mildly disagree, had some powerful parts for me; perhaps I see it as more compelling because I have the context provided by having read the remainder of the lecture. Still, I hope putting it here helps the PP rededicate itself to fundamental principles.