Lets figure out what's going on in a more mature way.
What on earth is that thing?!
As the aliens watch the human's destroy themselves in udder chaos, it gets calmer. The sounds of people getting along and assessing the situation at hand can be heard. The aliens, are not happy with this. Their mission can not be complete if the humans aren't eradicated. So, the first alien gets an idea.
The first alien opens a glass lid that has a shiny, untouched red button under it. He presses the button and explains to the second alien what it does and how it will help them on their mission. The problem is, a human is needed to power it. So they go to Charlie's house and suck him up into the UFO. They throw him on the a power extracting machine against his will. It drains his energy leaving him unconscious. They get a jar that has pure human energy inside of it.
They set the jar of energy in a capsule and then the control panel glows more ominous. The first alien says the panel is voice automated so he says the pass code. The machine is now working. The panel takes control over all of Earth's nuclear weapons and detonates them. The aliens detonate all of the bombs, explosions rage for minute after minute, and then dead silence...