I used to work for a construction company and the number one rule on the job site was always, "safety first." That is unless you just needed to do something real quick. Or unless you forget. Or if you thought to yourself, "C'mon. What are the chances something will happen?"
In those cases rule of "safety first" was waved and replaced with, "Meh. I'm sure it'll be fine." Sometimes this new rule worked out, but most of the time it did not.
So, no. I am not surprised any of these things happened. But please don't repeat them at home.