We don't have to cook our food, we just have a better survival rate, and process it better if we do.
(and a lot of the reason it really needs cooked these days is because 1, animal husbandry has killed out wild game which is less likely to have the diseases we cook to avoid, and 2, agriculture (having many animals in tight place with no roaming) also causes more animals to be in contact with each other making it easier for these parasites to get in the animals we eat...