A quick anecdote on the benefits of unilateral free trade: When your country lets in imports, untaxed, no matter how the other country does it--even if they subsidize exports to you, even if they tax yours to death.
Unilateral free trade has been shown to be beneficial to the country that has it. That means, even when the market is not free on the other side. It passes the logic test too. Here is a quick exercise.
