The accident in the first video must have been a pilots error...
The helicopter did not appear out of nowhere-so he must have seen the cable on the approach.
When i am going to land (and get the time, of course), i always get out of the cockpit to have a quick view about what is happening around.....
But-of course.......all of us have done stupid things in our career......fortunately, most of the times nothing "bad" is coming out of that.....