For the record here, modern technology is goddamn scary when you're out of the consumer grade. Modern technology is several decades past what you need to end the planet. As head of state we'd be able to access all of that.
For scale between 1950-1970, decades more primitive than we're talking about, the US produced thousands of
Nike Hercules SAMs. Which are Mach 4 missile systems intended to shoot down bombers by hitting them with smallish nuclear warheads before they could drop their own nukes. For entirely rational Cold War reasons. We probably wouldn't get nukes right off the bat, but let's not underestimate what we're talking about here.
We're talking super computers, stealth jets, and industrial equipment capable of producing things as complicated as computer chips and space ships. Again, not necessarily all available at once, but it's not packing peanuts just because it isn't intrinsically superior to everyone else on earth.
To make your hell into a planet you'd only need to shift to modern tech and drop the deadly fauna for earth grade animals. Which are also really dangerous when in untamed wilderness, so it's not that insane of a loss.