My super suspicious mind has often wondered if it’s more about destroying evidence of what they have been putting in our food more so than creating a shortage. You don’t have to destroy a whole processing plant to create a food shortage. That could be done numerous other ways. You would, however, burn it to the ground to destroy evidence that you were poisoning the population during the processing of the food.
I put nothing past these people to reach their target global population of 500,000,000.
Those food plant fires always looked to me like “insurance” fires. But that would match with the notion that they needed to bury some evidence. And re-construction would make an opportunity to clean it all up?