> If it died due to disease

We're discussing roadkill bear. Meaning a bear that was killed on the road (by a vehicle).

It's technically true that it still could have any of the scary afflictions you mention, but that's no different than any hunted game, or any industrially farmed animal.

Barring prions or poisoning (incredibly and quite rare, respectively), all of those issues can and would be evaluated by someone who intended to consume the animal.

I'm curious if you consume meat, and if you've ever been involved in the slaughter or processing of animals.