What you are saying sounds reasonable, but I still feel very strongly that prevention is the key. Consider that prostate and breast cancer are extremely common,

What you are saying sounds reasonable, but I still feel very strongly that prevention is the key. Consider that prostate and breast cancer are extremely common, occurring in 1 in 6 men and 1 in 7 women respectively in Western countries. As someone that treats cancer, I can tell you that management of an established cancer, even if detected early, is very complex and highly unpleasant for the patient, if not only psychologically. This is unlikely to change, except it will get more expensive. The strongest argument is an economic one. If we can develop preventative treatments that we can just give to everyone, it is a much more justifiable expenditure. The risks and benefits are much clearer. This is in contrast to what we do now, which is apply extremely expensive and complex care to a group of people that are diagnosed with cancer. There are only a small number of people in the world that can even get this care. Consider that a preventative therapy is the only type of therapy some people in the world will ever get for their cancer. Papua New Guinea for example has zero oncology specialists in a country of 8 million people.