Just noticed this thread and it's good to hear that my views are echoed by what appears to be everyone as it's not something that gets discussed much, well if at all.
I'll have to own up to taking said biner from Step on It - a funky route - and would do so again if another is left on that particular bolt. If however a draw had been left on that bolt and the one above, then it would have been obvious that they had been left for a redpoint and I would have left them as the first three bolts can be easily clipped by aiding or with a stick clip.
If you want the biner back then no problem. I had been intending to leave it on the lower off of another route if I found one that needed it.