Fair point, and I don't mean to endorse the quote as psychiatric advice (nor do I believe the quote was intended as such). I took is as an amusing expression of a general principle, that people with deluded beliefs may be quite rational in following the consequences of those beliefs, which should be taken into account when dealing with them.
Is the point to keep them from injuring themselves while trying to break the walls down?
Rationality quotes time!
The usual rules: