Here's something I've always wondered. At the opening of the film, Bronson's character, Holland, refuses to help hunt down the evil Doctor, even after viewing the horrendous videos detailing the evil man's deeds. Then, a couple of scenes later he just shows up and says, "Let's do it."
What made him change his mind? Was a scene left out, or is it just supposed to be a mystery?
All I could guess was that his friend the reporter was killed, plus after thinking about those videos of all those victims who survived might've gotten to him finally. Also, it might've been a long time since he had a hit, so maybe the whole idea got his juices going again.
shareHolland was asked to kill the Doctor before, but turned the offer down. He must feel partially responsible for his friend's death and needs to atone for it.
The posts here are all good guesses. The movie gives very little information about Holland. They probably wanted to make him mysterious. I read that the book gives much more information on the character.
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