Common headcanon about changelings includes ability to sense emotions. This, actually, is an excellent justification for them being fundamentally better towards each other, than ponies (and humans and any other race), as they don't need to guess and account others feeling, they need to learn to ignore them. From perspective of such creatures ponies, being food source or not, are fundamentally socially inferior and deserve pity and charity at best and mercy kill at most, depending on details of

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1) Nightmare Moon had great potential that was dumped.
2) Sunset shimmer was the only pony with guts to go against the system and her potential was dumped.
3) Discord had great potential as ultimate Big Bad that was dumped
4) Equestria is tyranny with good publicity.
5) Changelings have great potential as everyday performers and probably two-thirds of performers are changelings
6) Diamond Dogs, Griffins and Minotaurs have great potential for industry.

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