You forgot one important element to food handling:
In America it is illegal to discriminate against, say, religion. So what we have are many muslims handling our food. Take Pilgrims Pride. This chicken processor has hired 10,000 muslim, black, Somalies that were allowed to immigrate to the US by then president Bush.
These people are muslims first. I don't trust a muslim as far as I can throw, ummm, scuse me, shoot him.
One of the tactics used by Osama bin laden was to introduce poison in the food supply of his enemies. Ricin was a favorite because you could feed it to your enemy in small enough doses that it would not kill immediately but would accumulate over time until a fatal dose was reached.
I don't trust muslims.