The engine failing isn't some random, unlucky event. Regular maintenance and inspection should prevent this. Whenever this happens to an airplane it's considered negligence - there's no reason why we shouldn't have the same standards for ships.
Not always. We have regular maintenance done on our SMT lines by the company that manufactured the machines. Those things still fuck up once or twice a month, very unexpectedly, and almost always in the middle of a high-value operation (IC or LED placement.)
That said, I don't think it's immediately considered negligence when an airlines engine fails. Its premature to call Dali negligence as well; it may very well be but the investigation needs to complete.