Of course the free market causes inequities, real life causes inequities! This is the natural order of life. Therefore, it is up to the redistributionist to provide a justification as to why inequality is bad, and how to overrules freedom. It is not about "pretending" that freedom is correct, but it is about asking: why should we disrupt this?
People can be more unlucky than others. Is it the government's role to take from the lucky and give to the unlucky? Why? What is the principle behind this, and what does it achieve?
I can list many examples that have always failed to help the poor. The minimum wage, foreign aid, social welfare... the list goes on. Now, I ask, what is the point is government intervention, if these policies do not even achieve their intended effect? In fact, if you want to help the poor the best thing is the leave the markets free:
Further, it ensures that classist heirachies are less prevelant: children of the hard workers of last generation aren't completely riding off that previous success, children of the impoverished of last generation don't have to remain that way.
People often analyse capitalism based on today's problems, but that is an incorrect analysis. Today, we do not live in capitalism, we live in a highly regulated market.
This is fuelled by the failures of government policy. This on-going cycle is magnified under redistributive policy because of incentive traps and laws that prevent their freedom to work (minimum wage)! If the government would leave them alone, they could find a job and work slowly to build a wealth. It is freedom that fosters dreams, not government intervention. Social welfare traps the poor, while minimum wages make sure the poor can never start. Many migrants from Communist countries moved to Western nations for their freedom. Back then, there was little or no minimum wage or social welfare benefits, but instead, migrants could begin to amass their wealth. The wealth that they build up is passed on to their children, who can then achieve a middle-class life and aspire for things that you and I do.