as well as badger baiters, alot of dairy farmers have a BIG problem with badgers (though i don't think the link between badgers and cows getting tb has been proven?) -- maybe that's more of an irish thing though? whatever, it is definately a good idea to remove any dead badgers from the side of the road.
if you find a dead badger (road kill or whatever) i think there's some wildlife group you should report it to -- can't remember who though.
in a similar way, i work as a volunteer for the irish whale and dolphin group -- it's important that this kind of thing are recorded.