…doesn’t Steven Moffat (who didn’t write that episode) know that…
NOT EVEN ONCE
This isn’t even all the time he did. How about Four building a bazooka with Leela and then later a laser cannon out of a lighthouse? Or the fact that he built a gun with lethal settings into every K-9 he built (and had K-9 use those settings)? Or all the other times he manufactured and/or used weapons, including explosives.
You can be as condescending as you like but this time was different and you bloody know it.
No. No different. Only different in your mind.
(Yes, I’m mixing my fandoms and quoting Yoda, but I DON’T CARE!)