It has been well argued that "The Blank Slate" argument is wrong, or at least more complex and subtle than that. In Pinker's book The Blank Slate" in particula

It has been well argued that "The Blank Slate" argument is wrong, or at least more complex and subtle than that. In Pinker's book The Blank Slate" in particular. We are born blank of our mother tongue, but are wired to acquire one. Not wired with the skill itself, but with the propensity to acquire it. Both nature and nurture are deeply important to the outcome.