You posed the question (NCE 13 January) 'is it worth investing in a tsunami warning system-' Apparently 34% - presumably engineers - said 'No'. I cannot imagine what planet they are living on. Of course it's worth investing in such a system!
The word 'system' in this context must surely mean not just the sensors and communication technology but also the trained human infrastructure to react on the ground. This seems to have escaped some of the sceptical experts and academics whose comments you report.
Even if it did mean just installing the technology it would still have benefit in raising awareness of the threat and providing some warning that will save lives.
Once again, it seems there are negative-thinking engineers whose reaction to mankind's worst disaster in modern times is to miss the big picture.
Stephen Booth, 2B North Road, Stevenage, Hertfordshire SG1 4AT, UK