Good stuff, Katerina!
Ben, with respect, I think you're taking it a bit too literally. Most philosophical statements shouldn't be seen as purely "black" or "white", and we should allow for some nuance. That doesn't mean that EVERYTHING is nuance, however!
When you talk about how we shouldn't kill someone to take their possessions, it's not the "belief" that makes that idea true; rather it's the fact that a world where "robbing/killing is ok" would make for a very fragile and unstable existence for everyone.
I think the writer (whoever that may be) is speaking to those folks out there, whether "left" or "right", who live their lives according to a dogma that prevents them from considering the well-foundedness of that dogma, as well as its effects on society. As such, I think it's helpful and rather profound! Many of us need reminders, from time to time, not to be so sure that "our way" is the "right way"!