One of the most important tenants of Judaism is not eating pork.
It wasn't uncommon for pigs to eat corpses. We didn't always bury them so deep.
What better way to ensure that we don't get diseases from pigs who ate human meat (especially the brain?)
Embed it into your religion!
We talked about doing this with the Nuclear warning symbols, but there's always a risk of losing the context.
Even if the reason goes away, the prescirption might last.