I believe there are a lot of people who hear about marijuana and edibles assume that they are the same. While marijuana is the base for edibles, it is a lot more concentrated in the edible form than marijuana itself.
Edibles that are packed in candy form are far more likely to be eaten by people who do not know that it can include 12 individual doses. For this reason, I believe that the doses need to be individually packed for safety reasons.
Marijuana itself does not cause these issues because it does not look "tasty" and is much less potent.This is kind of like blaming the hops for beer and the potato for vodka.