It is said that Devadatta, before turning on the Buddha, was a good monk with psychic abilities and grace. What were the motivations behind his goodness before he turned evil? Was he only being kind to earn a good image, and so later on was feeling unsatisfied and wanted more?

When given advice by Devadatta (or a Devadatta-like person), should that person be ridiculed as a Buddha (i.e. the Buddha that he pretends to be), or as what he is behind the mask? Or both? When a hypocrite calls me up to behave in decent ways, then in order not to get tangled up in his net, I naturally get the urge to ridicule the Buddha into his face (possibly before ridiculing himself), in order to give a clear sign of not adhering to fake advice, even if giving that sign requires temporarily insulting the real Buddha. It’s as if saying “I’d rather ridicule the Buddha himself than take his Dhamma from someone like you”.