This is one of the reasons why people become gankers. The other one is issues, yes. People posting on the forums and complaining about it has the contrary effect because gankers want just one thing - to make others feel miserable. So if they see forum complaints about lowbie ganking, it means they're successful. Yeah, I know it's pathetic. It's just how some humans are...
I just don't mind such people anymore. They will defend themselves and claim that ganking is fun, or that the game is called "WARcraft" for a reason, or that it's part of the open PvP, or that their vengeance is righteous... These arguments are all so plain that I just feel pity for such players and move on to another quest or zone.
1) Fun - you chase an enemy player, who is slower than you due to slower or no mount at all. You then click one button and kill them. Yes. Fun. A lot of fun, yes. Really.
2) The game is called Warcraft, yes. So in times of war it is totally OK for fully armed and equipped soldiers from one side to go and butcher peasants from the other side? No. And there's military trial for this.
3) It's part of the open PvP - just because you CAN do it, doesn't mean you SHOULD do it. Read 2).
4) It's righteous vengeance - if you gank lowbies because you got ganked as a lowbie, how does that make you any better? :) Have you never thought about this before? You're just as bad, if not even worse, than those same people who ganked you.
If for you another player being from the opposite faction is enough of a reason to kill him, then I dunno... If he's +/-3 of my own level, of course I'll attack him for the sake of outdoor PvP, as long as he's not low HP - then that's just cheap. As a rogue, I usually wait for my mark to finish a mob and maybe eat & drink if they need. It's the honor of combat, the beauty of fighting an equal opponent, NOT for the sake of necessarily winning but for the sake of the fight itself... And it's something that gankers just cannot comprehend.