Can you show me cases where a bridge collapsed because the engineers on the project said "this will be totally unsafe" and were overruled by non-technical business managers?
http://www.ejinsight.com/20180406-hk-engineers-raise-concern...
There are many more, but the fact that engineer's safety concerns were side stepped rarely sees light of the day after disaster strikes. Also it doesn't have to be a catastrophic failure. Sometimes the reduction of life span of a structure is cause of not taking care of all the concerns.
Also this does not stops with construction. Have you not heard about problems in cars or other engineering projects where safety concerns were ignored. If not, I have to ask you how old you are.
The second link has the same issue - the engineers cited as saying something is unsafe are saying that after problems are spotted and they are not the same people who built the bridge. Sure, anyone can say "that was clearly unsafe" after the fact.
To repeat, what I asked for is cases where the engineering management of a project said "this is not safe" at the time they were being told to build it and non-technical management then overruled them and put traffic on it anyway, that is, the engineers were not allowed to complete the job to their own level of safety satisfaction.