My point, Pace, is that a "cure" is never without consequences.
You can "cure" appendicitis by means of a fairly straightforward operation. But a few people will suffer side effects of said "cure" and be worse off.
So, as Gingernut wisely asks: "What does the evidence say?" To get the answer you try different things, find out what treatment works the best for the greatest number of afflictees.
You may well be right about cancer treatment 50 to 100 years from now. If fact I might even agree with you. But all we have to go on is what we know NOW.
Two things I'm sure of, though: Firstly, making a decision for a large group based on what worked for a couple of people is folly. And Second, seeking a magic cure with no side effects is also folly (See: Colloidal Silver; Krebiozen; Hydrazine; Lydia Pinkham's Wonder Tonic; etc.)