If you like "intense nailbiter" games a horde hunter might not be the best either, but I guess it's your choice.
I get that being farmed can be very frustrating, but I hope you realise that taking out your frustration in this forum is contra-productive. The people here are most likely not the ones that you want to call out. A message left here will never reach the majority of F2P players. Alliance and Horde players are all people, with the same potential for intelligence or idiocy.
It's an equally empty endeavour to pay back graveyard camping with camping yourself, as the group that you'll overwhelm, box in, and frustrate to no end are not the same people that frustrated you.
You say that until now you've tried your best to stop other horde players from farming. You have been trying to adhere to your principle that farming is wrong. You have tried to convince other players, who have likely had worse camping experiences than a 24 stealth class, to let go of their resentment and not farm. Now you have reached the point of frustration these people arrived at before you, and you want payback instead of doing what you thought was right until now?
Again, while I get the frustration, I'm just saying that maybe you could take your own advice. I also believe that not sticking to one's principles makes one feel bad in the end.
I'm not trying to tell you what to do, the choice is of course yours, I'm just suggesting you calm down and think about it again.