Yes agree, aaand exactly - illusion not delusion.
As same as the fire example I would directly instanciate the Example on general Illusions.

There exists the situation where one may cripple the other people's illusions which are responsible for a significant part of their further development. Or like some most entertaining movies create weird illusions about love and how things work which cannot be kept in real life and might have them then people "misadjusted" for the rest of their life. In this way also Art has this same kind of responsibility.
As one may oppose a version where we achieve cooperation in our illusion to help us mutually strenghen our most helpful ones.

And for the article, just the salesmen attitude is giving it some slight bad taste.