The True Creature?

I mean is the dude evil or not? The Creature, on multiple occasions, shows sympathy and positive signs for humanity. Him cutting the wood and saving the drowning girl are perfect examples.  He decided to be of assistance rather than being an evil wretch as is usually his characterization.  However, he also turns to pure evil on multiple occasions.  So evil, in fact, that he cannot even control his incredible rage.  He states"...and my heart swelled with exultation and hellish triumph; clapping my hands..."(Shelley, 102).  I believe this initiates his true being and reveals his inner workings.  How can any mortal rejoice at the death of an innocent and helpless life?  That's the point Shelley is trying to distinguish to the reader.  No HUMAN could ever do that to another and rejoice; however, it is perfectly reasonable to assume and wretched daemon could rejoice at such a horrible event.  This is also why the creature is referred to as a creature not a man or an form of humanoid.  He is not of this earth because of his truly daemonic tendencies.