You're alive today, so surely you know better than to go around eating random mushrooms even though those mushrooms are natural. Natural is in no conceivable

You're alive today, so surely you know better than to go around eating random mushrooms even though those mushrooms are natural. Natural is in no conceivable way a usable heuristic for nontoxic. Trying to actually use that heuristic is a one-way ticket to Pain Town.