I suppose I am equating Lisa's death with the manner in which Arthur Freeman threw his child off the West Gate bridge... Marlywings quote, 'it offends our collective conscience' comes from that judgement... the brazen public performance of it , that strikes our common subconscious fear and horror, which is why we have railings and fences, etc... if we didn't have that common terror of falling from a great height, there would be no need for railings etc... 20 years doesn't seem enough in that context...