No one really knows because it depends on context. I could easily construct a thought experiment where anyone would steal but the contrived circumstances of that thought experiment would be so unlikely it is absolutely ridiculous. For example-
"Obama declares himself dictator for life and all the right wing extremists (i.e. everyone here) are rounded up and put into FEMA camps. While in the camps, a group of rebels, call them the Wolverines
, toss a biochem weapon into the Obama brownshirt barracks, and everyone in the camp- guards and prisoners starts dying horribly painful deaths where their intestines explode and they bleed out. However, the camp guards have a hundred vials of serum that will counteract the virus, they plan to adminster it to the 100 guards. You have the choice- do you steal the serum to give to the 100 children in the camp or do you obey your absolute moral principle against theft and let the children die so the guards can live"
Yes ridiculous, yes absurd, but I'm guessing even Derek and Martlet would steal to save the children, with the caveats of "It's not stealing in war" or "They gave up their rights not to be stolen from when they imprisoned innocents" or whatever. And I would say "It's nice to find out you're an untrustworthy person with no morals"