I use whatever language it takes to deliver the message, and unfortunately for some of the more deluded I have to use the verbal equivalent of a 2x4 - which will work, except with the most mule headed -

That said, it has been pointed out by others, that sometimes children do wander in, even to a remote location like the Habitable Zone...

This plan of Tumlinson's, that NASA stop Space Station, abandon the shuttles, and then fly off to Mars, is insane. Further, the tactics that his supporters have used against those of other views are fascist. As Mars gets hit by sterilizing radiation every so often, this man is leading the space community into a dead end street.

EP