It’s a good thing they haven’t made missiles to sense oversized shitted-in diapers, or he’d have really been in trouble

Why are you conflating an inability to practice emotional regulation in a sudden, horrific event to the same in the topic of conversation: trying unfamiliar foods? Emotional response is a muscle, and while there are certain things which cannot be practiced for, there are absolutely others which are entirely trainable and controllable, barring some massive disability that leaves you unable to function independently in society. Having an aversion to new experiences is absolutely something most people have the tools to cope with, and I say this as someone who is on the AuDHD spectrum.