Are Lawrence Mulloy and William Lucas legitimately guilty of manslaughter?

They didn't want to stop their schedule of launches to wait for Morton Thiokol to properly fix the O-ring problem. They deemed the issue with the O-rings an acceptable risk and put in a waiver to keep the shuttles flying. Mind you that it was astronauts who entrusted them to make the right decisions in the very first place.

https://www.nytimes.com/1986/06/05/us/key-nasa-rocket-official-quits.html

https://webcache.googleusercontent.com/search?q=cache:E9nBSFvYGyEJ:https://www.orlandosentinel.com/news/os-xpm-1987-01-25-0100310149-story.html+&cd=14&hl=en&ct=clnk&gl=us

https://www.csmonitor.com/1986/0708/ahunt.html

https://hollywood-elsewhere.com/2020/09/ernest-hemingways-the-killers-2/

https://webcache.googleusercontent.com/search?q=cache:A0tLP9gA-wMJ:https://www.latimes.com/archives/la-xpm-1986-07-17-mn-21673-story.html+&cd=17&hl=en&ct=clnk&gl=us

https://www.washingtonpost.com/archive/politics/1986/06/10/criticism-for-engineer/1a62a4bc-cdc5-4349-80e0-1842fe53ba17/