The Social contract is necessary because, without civil authority, once war begins it is likely to continue.
The Social contract is the source of all the 'de facto' authority which exists in a context of subordination.
The Social contract is an agreement among the future subjects, incipient subjects, not between incipient sovereign and incipient subject. The future sovereign remains outside the contract.
The Social contract is far from destroying natural equality, substitutes, on the contrary, a moral and lawful equality for whatever physical inequality that nature may have imposed on mankind... so that however unequal in strength and intelligence, men become equal by covenant and by right.
The Social contract is purportedly established to guarantee equality and protection for all, but its true purpose is to fossilize the very inequalities that private property has produced.
The Social contract is the surrendering of each individual, his rights to one person (physical or moral) who thenceforth becomes the bearer of the personality of all the contracting individuals.