How could it be your fault, that he punched someone in the face? If it wasn't this he would have lost it some other time.

I get why you would feel guilty, but it's not your fault or responsibility. He behaved completely unprofessionally and deserved what he got.

His lack of self-control is not your concern. Don't feel guilty. Your error was small, his was large.

Nope, that's all on him, dear. Not your fault at all.

You were testing on a production server? For shame.

Childish Reaction: Vent frustration, yell at co-workers and punch your supervisor. Adult Reaction: Fix the issue as quickly as possible. On Monday, review procedures and figure out how things went wrong... ask for a new process to prevent mistakes, especially on Holidays.

It was him punching your manager that got him fired, you had no control over his actions. However, your sense of sympathy is well-placed. Don't feel guilty, but do feel sorry for him.

Not your fault he punched a guy. I do understand why he'd be angry even if it was a mistake. Working Christmas is hell sometimes especially if you're missing family. However still no excuse for that

You are not responsible for another's foolish actions. He decided to act like fool, he got himself fired.

Do you by chance work at Steam?