> How many people have died because of that lax safety attitude?

That is complicated to assess, how do you account for the indirect and long-term fatalities or illnesses? E.g. here in Germany's south east (bavaria), every hunted boar is still tested whether it contains safe levels of radioactivity. Chernobyl was 34 years ago, but it still is a problem for food safety several thousands of kilometers away from the place of the accident.