This kind of revisionist statement is why people are suspect of people saying "it's bad, but not all that bad". They are usually lying about lots of things, when they supposedly have the facts on their side.
https://ourworld.unu.edu/en/radiation-from-fukushima-disaste... https://world.wng.org/2014/09/locals_suffer_long_term_effect... etc
Many of the barriers are due to simple game theory. If a project mischaracterizes or has an unlikely event that results in a leak, you cannot take it back. The damage is done and likely is out of the project's control, to some degree.