There is something inside of you that is seeing that these errors are easy to play on.This can build into a serious moral deficiency, or not.Yes, over something just as simple as that.Even so, it's not because they are un-intelligent, it is just because, #1, they are running a business and some price higher than others.#2, like you said, they hire people because they need help.Sometimes, actually most of the time, it is staff that only goes there to work, really not having an advanced knowledge to intervene and make things right.
In the end, it's on you. Know what I'm saying?