I don't want to repeat my previous arguments. Suffice it to say that there are, of course, different categories of demonstrators on different subjects with different degrees of understanding.
Free trade is absolutely basic to human nature and human beings.
Early man could not have migrated to the furthest ends of the earth and into the most inhospitable habitats lacking some basic resourcess unless he had also established trade ties with the locality he was migrating from. It's really as simple as that. Without free trade, the developed countries would still experience the downsides I have mentioned above, but the undeveloped countries would have no chance at all of further increases in the standard of living. But this is taking me away from the main point of this discussion.