system
Given the following post, respond as if you're commenting on Reddit:
human
Why can't you refreeze meats?

What is the danger of refreezing meats?  
Why is this danger not present when refreezing veg for example?
gpt
Two reasons, though neither will stop the meat from freezing again if you stick it in the cooler...

1.  Bacteria.  If you warm the meat up to room temperature, you start the process of bacterial bloom on the surface (or inside, if it's ground).  Freezing it doesn't kill the bacteria; it just halts the process.  Allowing a couple of cycles to occur before cooking can result in a much higher bacterial count than would be safely expected.  

2.  Crystallization.  Water forms sharp microscopic crystals in cells when frozen.  Repeatedly freezing and thawing a piece of meat destroys its integrity to the point where the texture and even taste end up "off".  This won't hurt you but your guests might pick a new venue for dinner next time.