Well, we can all study biochemical mechanisms in tumor cells every day of the week. And we can crank out tens of thousands of potential clinical candidates to hit them, run the assays, and then turn around and do it again. We can send things through all sorts of tox testing, take them to the clinic, try them against all sorts of terrible cancers, and amass enough data to make it through the FDA. Then we can let the oncologists continue to try variations, combinations, and regimens in the continuing search for something that works.
And every so often, we actually succeed. Childhood Hodgkin's lymphoma has one of the highest cure rates of all cancers. We can actually do something about that one (as opposed to, say, pancreatic cancer, which we can't do much about at all). Children who would otherwise die - and die slowly - now get a chance to live, to grow up.
But we can't, apparently, convince everyone of this. Many readers will have heard over the last few days of the case of Daniel Hauser of Minnesota, a 13-year-old diagnosed with Hodgkin's a few months ago. Instead of going in for rounds of chemotherapy, the boy (who has said that he doesn't believe that he's sick) and his family have opted for "Native American alternative therapy", and have fled from a court order. The boy's mother, who apparently does believe that he's sick, has said that she's treating him with "herbal supplements, vitamins, and ionized water".
These will, almost certainly, allow the lymphoma to kill him. Chemotherapy and radiation, on the other hand, will very likely allow him to live. If someone is bleeding to death from an arterial wound, anyone trying to heal them by invoking spiritual powers or alternative therapies would (and should) be shoved aside by any onlooker with a tourniquet. Daniel Hauser is bleeding to death as well: just more slowly, and in front of many more onlookers.