The case for trade is not just monetary, but moral. Economic freedom creates habits of liberty. And habits of liberty create expectations of democracy.
Where some people are very wealthy and others have nothing, the result will be either extreme democracy or absolute oligarchy, or despotism will come from either of those excesses.
I told the students that we can exert pressure without resorting to violence, and that we can move towards democracy without violence; that way, God will allow it.