[jpatokal]

No, the different distribution model (refrigerated in the US, not so in the UK) is because washed eggs have to be kept cold, while unwashed eggs do not.

As far as I can tell, the only reason for the US clean-disinfect-keep cold regime is that it ensures consumers get pretty-looking poop-free eggs -- and, as a not inconsequential byproduct, don't accidentally get bird poop and its assorted nasties into their food.