Since I'm arguing that the idiotic court system is the problem here, discarding personal responsibility for some uber Mommy who will 'protect' you from your own foolish idiocy, I personally don't give a rip if it's either.
But in this particular case you're wrong, going by previous case law - a person ate five servings a day of locally made peach ice cream and later succumbed to cyanide poisoning. The family tried to sue the ice cream maker, the court dismissed the case stating that 'the courts aren't there to protect people from doing foolish things.' As a sign of how foolish this was, the text includes a suggestion that suing an ammunition maker because you shot yourself with a gun would be equally foolish. This was in 1946 - my, how far we've fallen.
“But in this particular case you’re wrong, going by previous case law”
Not really, since that case isn’t comparable. You’re using an example of a naturally occuring toxic ingredient that would be easily ascertainable by anyone who wished to know. Just as dog owners generally know you don’t feed stuff with chocolate in it to dogs, or you don’t eat lots of shellfish when you are pregnant. My example was of someone intentionally adulterating their product nobody would reasonably assume was toxic with a toxic ingredient, and then neglecting to give any warning of that increased toxicity to the consumer.