"The human creature is the only animal that knows it is only an animal... and therefore the only animal with the option of not behaving like an animal." - The Age of Absurdity (Michael Foley)
"Verily, We create man in the best conformation; and thereafter We reduce him to the lowest of low; excepting only such as attain to faith and do good works: and theirs shall be a reward unending!What, then, [O man,] could henceforth cause thee to give the lie to this moral law? - al Quran At-Tin 95:4-7
We have been created with the ability to judge between good and bad, to choose between doing good and bad. If we don't use this judgement, and we just go with the flow, with the norms of the society regardless good or bad - then we are as good as creatures who cannot think.