Oh sure, it all starts innocently enough. A multi billionaire corporate mogul and (begin invisible bunny ear swoosh) philanthropist (end bunny ear swoosh) announces his intention to develop a nuclear reactor capable of generating emission-free energy for up to 100 years without refueling.
Next thing you know, he'll quietly begin assembly on a massive space station orbiting the Earth, complete with a fleet of interplanetary space shuttles equipped with death lasers. His masterstroke - a diamond-tipped drill able to reach the Earth's inner core and unleash liquid Hell onto the surface above unless the world can come up with a suitable ransom.
Bill Gates must be stopped.