He assumes the characteristic Platonic view that all men seek the good, and go wrong through ignorance, not through evil will, and so he naturally regards the state as a community which exists for the sake of the good life.
Socrates asks Protagoras why it is not as easy to find teachers of virtue as it is to find teachers of swordsmanship, riding, or any other art. Protagoras' answer is that there are no special teachers of virtue, because virtue is taught by the whole community.
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