You would complain too! Now their farm are destroyed and they became dependent on US agribusiness (the later employing their displaced farmers as "undocumented" laborers) and their food costs more. Typical bait and switch tactics.
I don't think there were any bait and switch tactics being employed. It's just the way things worked out. There really hasn't been a corn shortage. Supplies were a little lower than expected mainly because of drought. But the main thing moving prices now is speculation. There is a fear that corn supply will be really tight because so much corn is expected to be used by the ethanol industry. Farmers in this country are likely to plant several million more acres this year than last and if the weather is good and yields are as high as they could be corn prices will tank again and Mexican farmers will be in the same boat they've been in in years past. The market will be flooded with cheap American corn. It is winter time in Mexico too though. They can gear up and plant more corn when planting season comes. The difficulty of course will be knowing how much to plant. Corn futures may be trading high now, but will corn prices be high come next harvest? We'll see.