I saw we all just calm down a wee bit
I think everyone is on the same page of what happened to the OP sucks

loosing a tame you want is never any fun BUT like many have said, the rogue tapped it first so, it was "his" I have met alot of people ( non hunters) who wont kill a rare if there is a hunter right next to them watchign or trying to tame, they will let aggro fall from them for the hunter. not everyone is like this though. As someone had stated, " Rares or NOT for hunters only" Everyone has a right to them. That would be like saying " Ok, hunters get tamable rares, BUT cant kill any other rares and non hunter classes, you can kill any rare mob that is not tamable to hunters" Now if someone is greifing yeah... thats just wrong and should be reported.
So in the long RUN: I am sorry you lost madexx, but alas, we cant say all rogues are bad, i have met MANY nice rogues in my wow time, and rares are not just for hunters, but it boils down to also, if someone taps it first, its rightfully theirs.
@OP: I hope you get madexx soon

he is quite a lovely pet
and for the gp:
*DONT DRINK AND FLY!!
( drinking and flying can lead to crashes into the sides of mountians, cities, rocks, and even trees, please drink responsible, you dont want a FUI ( flying under the influence))
Brought to you by: The flying mounted police of Azeroth*
hope that made sombody laugh xD