Actually, it's just that when I apply rules, I apply them consistently. It has come to the point that my players expect that from me. Thus, as a result of any ruling, they will now call me on it if the ruling affects something important, such as this.
They ask where I got the decision from, so that they know what to expect in the future. They aren't looking to argue with me, but instead understand how and when the rules apply.
I do sometimes tell them that I am making the decision based upon common sense ruling, but that's an admission of a house rule. It is important to me that when I do this, I really seek out that it was necessary. It also avoids unpredicted situations where the ruling is actually taking over another rule I was unaware of.
Perhaps as a failure on my part to be elaborate about what I was looking for, the first responses were made with an assumption that we were making rules and their explanations on the fly. Yet, I was really challenging the assumption, not the end result.
And I was having a hard time expressing that I didn't need explanations really - I needed (for lack of a better description) the legalese only, even if that came down to "There's no such rule" - because then, as a DM, I knew to make the judgment call confident in the necessity of such a call.
It will really seem like an unnecessary standard for anyone to try to hold to - making hard and fast rules decisions at every possible point - but for me and my friends, it works well for us. We derive comfort from such "stability" in rules.
We are actually not uncreative for it, though at initial appearances, one might think so. Instead, we simply express the possible in terms of game mechanics and let predictability (of the rules) take hold.
HTH