To be fair, Scott is usually the leader of the X-Men. If you're the leader, you get the fun of taking the blame when things go wrong.
It's just a bummer that they think he's being dishonest. The boy scout of the group. If they were talking to Magneto then I could understand the skepticism.
"Danielle... I intend to do something rash and violent." - Betsy Braddock Krakoa, Arakko, and Otherworld forever!