Here is the problem with your logic.
You're going bananas over Malkin swinging his stick in retaliation to a dirty rabbit punch. A stick that did not connect, thus causing zero damage.
Your argument for Raffl's dangerous rabbit punch being just fine is that
A) it happens all the time (as if that would make it ok, or as if every punch to the back of the head connects with the base of the skull, which is does not)
B) it wasn't hard enough to inflict damage
So one guy's indiscretion is ok because it didn't inflict damage in this occurance, while the other guy should be suspended although his indiscretion didn't inflict damage in this occurrence either.
Huh.
Bottom line is that if Raffl doesn't rabbit punch, Malkin doesn't stick swing. Both did bad things and everyone is lucky nothing really happened. But it all starts due to a dangerous rabbit punch that has no place in the game to begin with.