Really,

Perhaps you're right.

I just don't want the fear of turning down a plane to interfere with Captain's authority, and I don't want to see a couple of gung-ho get the mission done guys setting the standards either. Our Air Safety guys posted a list of items which should be ordinarily considered no-go. The instance I referenced was on that list, namely taking a 67 with no APU to deep SA at night.

It's all very easy for me to say since I'm an FO, but I made those decisions in a past life at other airlines whose safety culture was worse and where pilot pushing was rampant. I've also volunteered to take the calls when guys thought I was being a tool for having an issue with a plane. (No TCAS departing LAX during the absolute height of the fires about a decade ago. The lower third of the state was MVFR. Amazingly enough, "No Parts" turned into "Parts" just like that)

It's not an easy decision, and there's not an easy fix.