Food regulations are often written with bulk producers in mind. When you have millions of pounds of meat from farms all over the country you are taunting disease. (Too many inputs to control. Farms all over the country, large facilities, long time between steps (harvest, processing, shipping, distribution, sale)). It's a miracle they are able to do this at all.
Your typical family is able to be far less sterile than any factory and nobody gets sick largely because it's not done at-scale (more pathogens from more places) with long delays between steps to give the pathogens time to replicate. The un-sterilized corner of my kitchen floor isnt going to make it into my food but the machines covered in meat paste might end up getting a bit back into the vat.
Your typical family is able to be far less sterile than any factory and nobody gets sick largely because it's not done at-scale (more pathogens from more places) with long delays between steps to give the pathogens time to replicate. The un-sterilized corner of my kitchen floor isnt going to make it into my food but the machines covered in meat paste might end up getting a bit back into the vat.