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The "Sister Act" star insists many artists, including herself, have lost their tempers after working long hours on films.
Whoopi's support for Christian follows leaked footage of the British actor launching a foul-mouthed tirade at a member of the crew who interrupted a scene on the new "Terminator" movie.
Whoopi, 53, said: "We don't know if this is at the end of the day. We don't know how many hours he has been working and it's tough. I mean I know it sounds ridiculous but I too have gone off on people because if you're a professional you know what you're not supposed to do. It is your art form."
Whoopi insists more precautions should be taken by members of cast and crew to avoid scenes being ruined.
She added on U.S. TV show "The View": "There are probably about 150 people on set and when you're about to shoot someone says 'quiet'. Everybody stops. You've six or seven people called assistant directors whose job it is to make sure no one walks through."
The three-minute long video shows Christian screaming at director of photography Shane Hurlbut: "Seriously, man we're f***ing done professionally. I want you off the f***ing set, you pr**k."