Hello Sir/Ma'am!
Answer- Because of the fact that the young wolves are one of the few animals to not follow the Law of the Jungle, that if they did, Mowgli may not have ever grown up with the animals- or even grow up at all. By the author making the bold choice that the wolves don't obey the Law of the Jungle, the author is trying to say that you can be a free spirit!
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(This is hand written and proof read by four people!)
I know I am C R A Z Y late, but I do hope this helps, you or someone else!
Have a great day!!