So he didn't actually learn his lesson and fucking escaped the hospital at the end to continue his murderous rampage.
why are you trying to make assumptions with no proof whatsoever
the final scene was to show his psyche had been set free. Who knows if he is going to keep killing, is it an integral part of his nature? Open ending, but quite poetic. In any case, this wasn't the story of johann, it was the story of Tenma: his ethicals doubts are once and for all gone as he knows what his task as a surgeon is. It's tenma's ending, not johann's.
he went to find his mama
this won't end well after the last thing she did to him and Anna
He never existed in the first place.
Hey OP, if you're still here
This thread can help you a bit