Just about every stat trades off on every other stat. One stat will reward one flying style more than another (by and large).
Meaning... if you fly to live and are very selective about your fights, you'll probably have a very high K/D and K/S, but a low K/T. If you're a furballer, your K/D and K/S will be lower, but you'll probably have a higher K/T.
Arguing that K/T encourages vulching doesn't hold water either, because all stats go up from vulching. Someone who vulches all the time will have an extremely high K/D, K/S, K/T, and hit percentage to show for it. With that in mind, we might as well just eliminate stats entirely if vulching bothers you.
So no, K/T belongs as much as any other stat does, though I do find the self-serving whining every couple of weeks about it to be quite amusing.
-- Todd/Leviathn