Why should you only do things with positive outcomes? Is that what life is about, only trying to do things that end positively? The ultimate outcome of your existence is your death anyways.
Solid point, but I do think most actions start with the intention for positive outcomes in some manner, and in at least someone's interest.
Passive aggressiveness specifically - I do think is a waste of time, stress, and efforts all around. I'll stand by that.