I'm not sure what logic you're referring to, I'm simply stating the etymology of the word and other words in its family.
So do I.
Nice comes from nescius 'ignorant'.
Travel according to the most common version comes from tripalium, a torture device.
If you assume that genocide must be about killing because it comes from a Latin word for killing, then being nice should be about being ignorant because it comes from a Latin word for ignorant.
Those examples I’m guessing have no record of those who coined them, genocide however appears to have such a record.