Every single time, a failure is down to *multiple* factors: a series of failures that all manage to align when unforeseen circumstances make failure not just a possibility, but an inevitability. Factors include human negligence or ignorance, lack of training/education, under-designing, building with materials inadequate for the job (either from cutting costs or because they don't know yet that the materials aren't enough)...
Not every engineering failure ends in deaths, but plenty do; and even when there aren't deaths, there are often serious injuries, and of course the destruction of materials, structures, and building equipment (like cranes or tugboats or barges, etc.). Hence the saying about policy being written in blood: all too often, people have to die before something is made truly safe.
I work for a hospital & we go over safety procedures again & again & again, because engineering failures happen for the same reasons why healthcare failures happen: multiple points of failure all add up until something collapses.
@Impious_Jade It's all numbers. We owned 95% of that segment. We had no solution at first so we kept a lid on it. I'm sure our lawyers said "screw it, the money we make is so huge we can handle a few lawsuits". And that children is the day I lost my faith in my company.
This is a big deal. It's an even bigger deal if it impacts a patient. This is why medical facilities of all kinds are regulated up the wazoo: to try to prevent and solve problems.