I think 1 is inaccurate – bacteria themselves (not just their excretions) can make you sick.
I think the idea is that the bacteria are supposed to be too cold to multiply and make their excretions by the time you cook the meat (and thus kill them off), so unless the meat is already spoiled, cooking alone would be fine.
Think of it this way
It can seem very compelling, it can seem like it ought to be true. It used to be commonly recommended.
I think 1 is inaccurate – bacteria themselves (not just their excretions) can make you sick.
I think the idea is that the bacteria are supposed to be too cold to multiply and make their excretions by the time you cook the meat (and thus kill them off), so unless the meat is already spoiled, cooking alone would be fine.