David Moyes believes the experience Paolo Di Canio endured at Sunderland underlines the precarious nature of football management.
Di Canio became the first Premier League manager to lose his job this season after his side picked up only one point from their opening five games.
The Italian's emotional reactions did not go down well in the dressing room and a number of senior players are said to have made their feelings known to owner Ellis Short.
It was all a far cry from the April days after Di Canio's arrival, when he masterminded a brilliant away win at local rivals Newcastle before turning over Moyes' Everton outfit at the Stadium of Light, results that ended up being fundamental in keeping Sunderland up.
"You go into a job and you have to live or die by your decisions," said Moyes.
"Sometimes it works and sometimes it doesn't. Sometimes it can take longer to get your opinions over than sometimes you are given.
"You never like to see people lose their jobs but I have no doubt Paolo Di Canio has a lot to offer in management.
"When he went to Sunderland, he beat me at a time when Everton only lost one game in 10.
"You could see what the Sunderland supporters thought about Paolo Di Canio. It is amazing how quickly football supporters and people can change."
Kevin Ball has taken charge on a temporary basis, with Gus Poyet and Tony Pulis favourites to take over full-time.
However, Moyes acknowledges Ball's knowledge of the Black Cats will not make it easy for Manchester United to claim a positive result from Saturday's trip to Wearside.
"We know Kevin Ball quite well," said Moyes. "He has been at the club for a long time and has stepped in to help out before.
"He has had a couple of games in charge already so we have had a chance to see how Sunderland have played."