Foot and Mouth/Bluetongue

The Secretary of State has dealt at length with the question of the degree of knowledge or otherwise of those managing and regulating the Pirbright establishment of the defects in the drains. But does he not accept that, irrespective of the degree of knowledge, those who manage and regulate any establishment that is built to contain, and does contain, a substance that is inherently dangerous—and that will cause great damage if it is allowed to escape into the environment—must per se be liable for whatever damage is caused?