> Regularly checking people that are otherwise healthy for cancer will turn up a lot of cancer through false positives or slowly growing ones, will lead to a lot of unnecessary intervention and will in fact lead to a reduction in quality of life and lifespan

This is completely irrational argument. Catching cancers early is crucial.

Furthermore, if better information leads to unnecessary intervention the blame lands squarely on the hospitals being overzealous and greedy.

> For aggressive cancers - the ones that are really problematic - you would have to do such a test too frequently to make any real difference

Because aggressive cancers go from 0 to dead in a week? Please.