The Thread about Beware! Children at play reminded me the ending of Shiki, an anime about a small town with vampires infesting it. The ending of which was glorious:
The vampires get absolutely massacred by the town inhabitants once they have a proof of the vampire's existence. The anime tries to argue that the humans became just as monstrous as the vampires, which is bullshit because the vampires not only continuously refuse to peacefully coexist with humans (especially as their blood drinking isn't lethal the first two days and can be done via IV, as well as the occupants being fairly nice to them throughout the show) but are shown to be inherently sadistic.