> Moreover, I know people for whom *images* of spiders or cockroaches or photographs taken from great heights can induce panic and vertigo. Should we be so insensitive to allow images that have identified phobias attached to them?
Banning such images is probably inappropriate, but using them should certainly been seen as insensitive.
That doesn't mean that speakers should be afraid of offending the sensibilities of some unknown member of the audience, but a little caution is appropriate. Any speaker who wants to be heard needs to give careful thought about how to present - not just what to present. When a speaker does over-step a boundary, a simple polite complaint and a simple apology should be the end of it.
The real problem here isn't the original offense - it is that fact that some people don't seem to be able to accept that others can reasonably have different standards, and that a community works best when people make concessions for each other.