I don't really see it as a problem and never understood why people get bothered over it. It brings nothing negative to the game, it just denies PKers (someone who many people would want to dissuade) what they want. I'd pretty much tell all of my tower guilds to suicide at 0.5 to deny tower PKers kills, and it usually works. Either that, or it makes the PKers dumb mad and they spend 2 hours to get 100 kills.
If the argument is that it's annoying, then look at it from the perspective of the player who is suiciding. I never really see people suiciding in open PK areas like others have mentioned in this thread. It's practically always at towers in my experiences.
I wouldn't care if staff did change how it worked though, I just don't think it's worth getting bothered over. I'm not a PKer though.