As I was chopping up and portioning meat for freezing, I had a random thought. I know everyone says pre-ground meat from the grocery store is a no-no due to the increased risk of bacteria. However, since it seems like most people follow the buy fresh and freeze for 3 days rule, wouldn't that apply to ground as well? If we're relying on freezing to kill bacteria and most parasites, does it really matter if the meat was pre-ground? Or are we just being extra cautious?