In our whole brucellosis eradication campaign there was only one case where a farmer was taken to court for concealing known infected cattle. Brucellosis is transmitted from animal to animal - BSE is not. Whole herd slaughter is not considered for Brucellosis which IS infectious. Whole herd slaughter is considered for BSE which is NOT infectious.
Brucellosis infects humans rather readily.
As I understand it there were rather large numbers of herdsmen and vets who caught Brucellosis, and the effects of this were often chronic and debilitating. It was always very clear that there was a relatively low cost and a very large advantage to notifying Brucellosis cases. Notification allowed eradication within the herd and improved safety to stock handlers. None of these are the case with BSE where at the low infection level that might be expected in BSE free countries it is most unlikely that any further cases of BSE would be seen in the herd and there is no risk to stock handlers. Other BSE cases would be randomly distributed amongst other herds sharing the same feed source.