Ok, there are two reasons I try to avoid an HO.
1) In an HO, it is very rare that my plane is not damaged or destroyed. I like to fight in a clean plane. Thus, I don't want bullets hitting it.
2) By avoiding the HO, I set myself up for a position of advantage on the pour soul who just wasted whatever advantage he had on me by trying desperately for the HO kill.
As far as HO's being right or wrong or lame or whatever you want to call them, I could care less. Any shot is a valid shot. If someone wants to blow their chances of beating me 1v1 by going for the HO, they are welcome to it. Yes, they piss me off, but not because it was a HO. They piss me off because I screwed up and let them shoot me.
-math