The general issue I've found with people that take this mindset is that they focus so much on the 0.000000001% risks that they miss a lot of 1% risks. Which I would say is unscientific in terms of minimizing ones risks.
This is a commonly (mis)-used argument, that misses the fact that if the statistics tell us the risk is less than some value (lets say 10^-6), the assumption is that the risk is 10^-6. Often, statistical tests have the power to detect very rare effects, but not effects that are even rarer. So less than 10^-6 does not mean the risk is one in a million, it means we do not know how low the risk is (could be 10^-23), but we know that it is no higher than 10^-6.
2. We have 8 billion human on this earth. Is it bad to have 0.00001% of human alive (i.e. a few thousands) focus on 0.00001% risk?