Re: The real question is...
Based on a 2012 study, for every 10,000 women screened 129 will be false positives.
So in half a million "not inviteds" that's 6,450 who weren't unnecessarily treated.
Puts the number of, purely theoretical, deaths into perspective,
I doubt you would consider it a "purely theoretical death" if it was your wife or mother who died because her breast cancer went undetected until it was too late.