This is no excuse, and allowing it to be an excuse is at the root of why things are going so wrong in Science. If your name is on the paper you 100% must own every word.
There should be some agreed sanctions for this kind of thing. I would recommend that if any paper is withdrawn all the authors should be prohibited from receiving government funding for 3 years, and they should be banned from publication & citation for 5 years.
I am thinking this would change the culture quite radically.