That's just wrong. Taking a test doesn't do anything to the data-generating process, your chance of death is 100%. The test merely informs your posterior about the timing of the event.
The timing is pretty important to most people, and is actually the whole point of taking the test in the first place so the generating process and the test are not independent. See ?! What you said is just wrong too ! ;-)
Public healthcare policy is absolutely not something personal.
It involves costs of healthcare for all people involved, workload on health professionals, hospital occupancy, etc and so forth.
If the rate of false positives in these tests are too high, people that need treatment for their actual illnesses might be on a waiting list because too many are doing follow-up screening and biopsies for non-issues.
And to address your silly "collectivist" fear-mongering, your hyper-individualist mentality is a societal disease. We could do with some more collectivism, in the sense that people have a better understanding of the constraints and conditions of the society they are inserted in.