If you found kids playing alone, and a dirty old man in a dirty old mac watching them with his hands in his pockets, what would be the quickest way to safeguard the kids?

1) stay there and make sure the old guy doesn't get up to anything dodgy?
 or
2) turn the kids out onto the street with the dirty old man?

Why is "closing down chatrooms" something that people accept will help save kids from dirty old men? or is something else going on here?