Caesarians for human babies are often done not only for the health of the baby, but of the mother. They are also rarely (if ever) done from a personal preference. Snakes lay multiple eggs to increase the likelihood of at least one surviving past laying. Humans most often only have one child at a time, multiple births past triplets are usually the result of human intervention, not biological design. Snakes are left to fend for themselves on hatching (excepting perhaps African Rock Pythons), human babies are cared for by their mothers until they can fend for themselves. Comparisons of "birthing methods" for the two are at best illogical. There are few similarities, we are designed for completely different methods of reproduction. If you were talking about the mother or other snakes being able to pip eggs to help them hatch the comparison might fit a little better. As it stands, it has little relevance as a reason to interfere prematurely.
Oh and as a further note....we have evolved to posses the ability to interfere in our own birthing processes to increase our chances of successful reproduction. Snakes, obviously, have not.