You mistated my position
Earlier, before I became aware of the severity of the radiation problem on Mars, I thought that it might be possible to terra-form Mars and to establish a "life-boat" there. But I proposed that this only be done after the best was done to ensure the lives of the far larger number of people living on the Earth.
I now realize with some sadness that establishing a "life-boat" on Mars is impossible.
As for an answer to your question as to how one man could be right and so many others wrong, I don't really have an answer for you. Perhaps if you reflect on your own work on the lack of water on Mars you may find one.
EP