If it would be only for enemy team this would be basically 3rd wolf or 2nd KK, nothing would ever change.
All teams would have those hero because you have to have that hero in order to counter enemy's one.
The core problem is not in KK but in Moon, making whites being spammed nonstop, basically providing one side with global permastun ability.
KK and DS just provides Moon with a free and easy ticket to start casting.
And MS+SE runes and you will get Moon starting cast ASAP without any counterplay except your own KK starting first.