Firstly, I suspect there is more to this story than is being told. I mean, why would anyone simply take this person at his word, unless you know him personally and can vouch for what he said happened? I seriously doubt that this player was banned simply for spamming an ability. If I had to guess I would say this person probably has dialogue macroed to his Holy or has done something alongside the spell. I've been playing Final Fantasy XIV since closed beta and I have never seen or heard of someone being banned or action taken for simply using an ability over and over again. There was always something associated with it that caused the action.

Secondly, why are people defending spamming in the first place? Ok, yeah, sure the person can leave but by that logic the person spamming could...oh I don't know...stop spamming. Since spamming serves no purpose whereas hanging around in a city could be for a legitimate reason my opinion is the person spamming should stop, especially if people have made it known they are annoyed by it. This has nothing to do with people looking for reasons to complain or just being whiny crybabies or whatever.

Personally, I think spamming in general, is just immature and, as I mentioned before, serves absolutely no purpose whatsoever aside from personal amusement. Frankly, there are other, less annoying ways to amuse yourself but then I come from a generation of gamers where we were actually respectful and civil to one another. Sadly, those days are gone.