Here is a shot back.
1-st, you make too many assumptions. You seem to assume that everyone wearing a comp knows how to use it and has it in order. Well, I do not think so. On my last trip, for example, there was one guy who just got his comp, so he was RTFM-ing between the dives for the 1st 3 days, till he got it right (or maybe gave up, no idea). Another guy's comp was obviously malfunctioning, or he did not know how to reset it, cause it bipped in the middle of the dive every time, telling him to go up. He ignored it, and so did our DM. So I won't be surprised at all that when your moment of truth comes--that is, you evacuate someone to the chamber--you find that the battery in his comp is dead. Sorry, Frank, but you did not check his battery before the dive, did you? Ooops.
2-nd, you make an assumption that "[if I am] not responsible enough to wear a computer, [I am] probably not responsible enough to re-zero the little pointer on [my] rented depth gauge or bring a watch that can be used underwater." But didn't you just said that a comp does not make scuba diving safer? And if this is so, then what has wearing a comp to do with responsibility? Convenience has nothing to do with responsibility, only safety has. And, BTW, I have my own gear, if you used the word "rented" [gear] here not by chance but as a suggestion that I am some kind of cheap shot or that buying a dive comp would require me to get a 2nd mortgage on my house or something. I had my experience of diving with comps, I do not like comps, and I do not like when someone is twisting my hands.
3-d, since you do not know my profile (you started with this), how will you figure out that I am violating tables?