In fact, most of us were not born under (into?) free-market capitalism. There is no record of any developed nation that has been built and maintained without regulation (in the form of laws which benefit specific sectors and industrial pursuits) and government subsidies. We were born into a regulated capitalist system (which only explicitly adopted the idea of the 'free market' in the 1980s). Moreover, many of us were born as a result of the well-being of our parents, something which has been achieved through government support (i.e. socialist policies). Alongside this, many were state educated. If you or your parents were state-educated then you should think twice before dismissing left-wing ideas.You were born under free-market capitalism, have benefitted from it every day of your worthless life, but choose to bite the hand that feeds you, you ungrateful loser!
A proper 'free-market' would not be possible. It would have to do away with all legal rights (for workers, employers, shareholders etc.) and any benevolence would be at the whim of those with capital. If you want to see what a 'free-market' looks like, look at those countries where workers are treated as expendable and where union activity is actively punished. Look at countries whose economies have been destroyed by whimsical corporate investment (by corporations whose assets are protected by the law of their own nation).
There is no such thing as a free market. In any economy, someone benefits while others lose out. Capitalism may be the best system available for maximising benefit; however, it does not do this by being 'left to itself'. This has been proven time and time again.