A spending plan that's imposed with a stroke of a pen, and that recklessly interferes with hundreds of millions of people, and forces them into economic relationships with people based on crude categorisations, like income levels, and simplistic formulas, like those that determine eligibility for government assistance programs, is no substitute for the intelligently formed personal relationships and market transactions that spontaneously emerge when property and contracting rights are respected and protected. The latter is based on the unique knowledge of hundreds of millions of people, that is aware of local conditions and opportunities for optimisation.
As for slaveowners, what they have in common with socialists is a belief that they have a right to forcibly confine those who refuse to surrender their rights to them.