Lyric discussion by DresdenDarling 

Cover art for Pierre lyrics by Dresden Dolls, The

Wow... Present and Angelundergravity, I think you are both reading way too deeply into this song. I think it was simply written as a song for children. It has a moral, much like many fairy tales, etc. I don't think Pierre was planning to blow out his brains or anything similar. From the context, I would guess he is about 4 years old.