Anyone can hurt someone with the best of intentions. In your case Susan, I'm pretty sure it was how she took it not what she did - probably looking for an excuse to resign (thats what the "last straw" thing means to me.
I'm pretty sure I hurt VW in our religion discussion a few days ago - and not because she took something wrong but because I had a prejudice I was completely unaware of.
Basically in the course of explaining my position on something I started by saying that it came from an emotional basis. But then I used what I thought was colorful way of saying that I tried to have a rational support even for beliefs that are not provable or do not have an emotional basis. But the phrase I used was not "colorful" . It was highly offensive, and I think I would never have been used if not based on a prejudice I was completely unaware I had.
Like most prejudices it came in part from ignorance and in part from fear. Although I'm intellectually aware of the issue I really wasn't until a few years ago - honestly believed the postion I held to be an enlightened one. So apparently the knowledge hasn't penetrated all the way down yet. The fear is that mental illness runs in my family; I'm at major genetic risk for a number of problems; so the particular phrase I used was not just sloppiness; it reflected a real personal terror that had congealed something nasty without my knowing it.
And when VW made an oblique reference to something hurting her and sending her into a blind rage it did not occur to me that it could he anything I said, until for some reason the clue fairy hit me this morning. I'll work on the prejudice, and in the meantime make sure I don't inflict it on anyone else again. So I'm sorry my personal weakness caused you pain VW. Hope that knowing where it came from lessens the hurt a bit.