This is certainly not their fault. Some individuals are unproductive because they are physically unable to work. Some individuals are less productive for other reasons which are of their own doing. Some individuals choose not to work. Some individuals choose not to educate themselves.
Some individuals are simply lazy.
Of course, some individuals enjoy a combination of these attributes. Socialism, in its effort to not only believe that all individuals are equal, but to put this belief to practice, appropriates the resources of the productive for the benefit of the unproductive. In so doing, socialism not only punishes the productive for the crime of being productive, but oppresses the productive in the name of social justice. Since intelligence is one of the factors that leads individuals towards greater productivity, socialism punishes the most intelligent twice. It forces the intelligent to live under the laws of the unintelligent and then appropriates their property.