Scientists are actually a mixed bag in movies and comics. In most cases, your Dr. Doom will have a Reed Richards. Science is itself shown as morally neutral - in evil or thoughtless hands, some new scientific development can cause huge problems, but science in the right hands, used for good, can solve problems.
Even in the Jurassic Park movies, there are scientists who aren't all evil, just a little too impressed with what they can do. Then there are the Drs. Grant, Sattler, and especially Malcolm saying, "Just because we can doesn't mean we should."