Hey don't blame the messenger. What do you expect from an evil wizard?
I tried complaining to the magic council but they turned me into a toad. Took me 30 minutes to write this lol. Webbed feet are shit. And you can forget using speech input.
From a fruedian perspective a wand and a tower can both represent a penis. Also a witch's broom.
TV tropes cites two references to this in Terry Pratchett Discworld novels in the Freud Was Right article:
"Going Postal: As she looks over Moist's ideas for stamp pictures, Adora Belle Dearheart notes that the stamp with the highest value has a picture of the Tower of Art at Unseen University — the tallest building in the city.
Adora: Oh, the Tower of Art... How like a man.
Lords and Ladies: Naggy Ogg tells Casanunda "Magrat says a broomstick is one of them sexual metaphor things." (Footnote: Although this is a phallusy.)"
So the wizards have the "hey you wanna see my tower" routine. A nice cup of mind control potion seals the deal.