The overall philosophy is reasonable measures with scientifically verified results.
Goal: Create a more efficient system that has long-term stability
Reasons: The current system is an entitlement, instead of tax/welfare system. The population shifts will not support such a system. It must be made more efficient by having forced savings for individuals (separate accounts). The drain on the system by the wealthy makes no sense long-term. Even if they paid in, it was/is a tax. If they can maintain their standard of living without the funds, then we should save the funds for those who cannot maintain their standard of living.
"The legitimate object of government is to do for a community of people, whatever they need to have done, but cannot do, at all, or can not, so well do, for themselves - in their separate, and individual capacities. In all that the people can individually do as well for themselves, government ought not interfere." -Abraham Lincoln