Is your complaint that you think people are being incarcerated when they've committed no crimes in order to have cheap labor? I find this notion pretty ridiculous considering you need a trial and jurors to convict someone.
Is your complaint that you think the laws are being created to specifically target people so that they can be incarcerated? In that case stop whining about it and stop voting for the people making these laws.
But I digress, you are right.. It's disgusting that the federal government makes any money on the people they pay to care for whom society has deemed should be incarcerated.