Your point aside, that particular example is not the best since it's a lot easier to quickly land a customer in the hospital as a random fast food worker than as a random software engineer.
That's the rationale, but most of the firings of fast food workers I've seen are not related to hygiene but rather due to scheduling and attendance issues. And very often because of management lack of planning.
It is not that easy, actually. There is remote possibility for it to happen, but it is not likely nor easy. You need to break quite a few rules and also be very unlucky too.
