How does rousseau's social contract theory justify the need of social "safety nets" such as america's educational system?

Social contract is some sort of social obligations that's expected to be done as a member of society (such as getting a job, provide for family, create products, etc)
This will result in contribution to the development of society, which to repay it, the society is arguably also need to give back to that person in form of safety nets such as welfare

Hi! after fertilization occurs, the zygote goes through mitosis and then differentiation (aka specialization of cells) to have a variety of cells that perform different functions. this allows for the creation of tissues and so on, all of which were once stem cells with no specific function.i hope i !