Maybe, sarcasm was aimed at 'natural' being 'harmless' and/or common, because it is 'natural'.
When really, just being 'natural', doesn't mean anything really. There are poisons that are 'natural'.
Like resveratrol. Yes, it is natural and its in wine. But you need to drink many gallons a day to get enough to do anything. But people see 'Natural' and wine, and think it is a license to drink a lot.
But its " Gila Monster’s venom".
So natural, but you aren't going to just go out and eat it like resveratrol from wine.
At this point, 'natural', just means made from atoms, yes atoms are naturally occurring.