[schmidtleonard]

Damage that is bad enough becomes easy to quantify, so no, "unclear" actually does put a bound on it.

Survival odds in car crashes demonstrate this nicely: count the outcomes and divide. If "the survival odds were unclear, scientifically speaking" then car accidents would have to be orders of magnitude more rare and less lethal than they are.

[whatshisface]

Sudden damage that is bad enough is easy to quantify. You should take a look at the decades long struggle to prove that cigarettes are harmful to see what it is like when the harm is chronic.