Here are the facts we do have.
I'm not arguing that such drinks are the least bit safe.
But the FDA only considers doses of over 5000mg as potentially lethal. That would be 31 cans of Monster. The girl in question drank 2 cans within 24 hours.
Clearly, something else was wrong.
Twice as many people die per year due to peanut allergies than caffeine drinks. We haven't outlawed peanut butter yet.