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Perhaps they shouldn't lead to capital advantages. Perhaps they should be abolished as differences, and anyone should be able to become as strong or smart or fast as they want. But to say they should be stripped of their implications is like saying 2 + 2 "should" equal 5.
Also, if they become purely volitional, then so too do their consequences. You can't be angry at losing a footrace for instance when you have it within your power to simply attach better legs.
