Prospero is more human now?

By breaking his staff and drowning his books is Prospero more human? Although being more human is alluded to in the play by bringing his enemies in front of him to show them mercy, I think that giving up his magic makes him more human. Also, another question would be why is Ariel so influential in keeping Prospero from destroying his enemies? Ariel has been doing Prospero's bidding throughout the play, how is it now at the end that he is influencing Prospero?