Hoy,
I still think this debate is to do with the fact that people want to PK with healers on a regular basis. Sure, right now the thrust of the argument is:
"Shouldn't healers be allowed to kill people who attack them? What, are they supposed to just sit there and take it!?"
This sounds reasonable enough, as the original author of the post knows, but how long do you really think that would remain the only situation in which healers thought it was alright to kill?
I think pretty soon we'd be hearing healers saying stuff like:
"Shouldn't healers he able to kill people who won't leave the area when they're ranking ... are they just meant to sit there and take it!?"
Or
"Shouldn't healers be able to kill people who talk crap to them ... Are they just meant to sit there and take it!?"
There are people out there, not saying you Icor, who want to play aggressive healers. This is because healers are the most invulnerable class in the game to death, while having some solid PKing skills. They run almost no risk of dying in any given fight if they're even a quarter way prepared.
If you allow leeway in the PK department, soon you'll have a bunch of boundary-pushers and rule-lawyers trying to take it further and further to allow them to aggressively PK with almost no decent RP reason.