My philosophy is, if people aren't getting sick from it, it doesn't matter. That's how I manage to shrug off those news reports about germs on keyboards and body fluids on hotel-room bedspreads. They might be gross, but humans evolved to be repulsed by things that might be harmful. If something's doing no harm, we don't have to worry about it.
But in the case of the spinach, people actually are getting sick, and the sickness can cause permanent organ damage or even death. As someone who got hepatitis in college, presumably from restaurant food, I can't take those things completely lightly.