A plausible justification
So Bob and Emme want to save wild, endangered animals when they grow up -- preferably furry cute ones with big eyes.
James wants to be a ninja.
More specifically, he wants to be a motorcycle-driving ninja. Who saves kittens and harp seals. That he can give to Emmeline to heal, because she wants to be a veterenarian.
"That's why I want to be a ninja," James declared today, eating a taco at dinner. "So I don't have to cook."