Dragons are generally much bigger than PCs or most other creatures, therefore whatever a sapient dragon does is "being the bigger person".
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Being the bigger person makes it easier to eat the smaller person.
Are dragons people, though?
Go ask one to its face. It'll either be mad that you implied it's less than human, or it'll be mad that you called it a person when it's so obviously superior to people.
If I'm face to face with a dragon all I'm doing is giving it a smooch.
Sapient creatures are people, yes. Especially when they speak human/humanoid language, which is true for many (most?) dragons in tabletop settings and even Lord of the Rings. In Faerun (D&D) they can even easily transform into humanoids.
Try reading "The Tragon with the Girl Tattoo“
You forget that they are dragons until they grab a quick sheep before taking off.
One would assume they would target slow sheep, but who am I to judge their taste in sheep.
If they keep taking the slow sheep, they'll evolve to be faster and make the whole thing less convenient. Dragons live a long time, so they know from experience that in the long run it will be easier to only eat the fastest sheep.