SpoilerI rather think the opposite; we are gonna see the plus side to carny's. Its there in the description of lady dove... The ashen skin is a signmancy of those who had it rough; and you can combine that with the pain in her eyes as she admits she's a carny and how hard she seems to trying to get ANY work from digdoug. Carny's have it rough.
And really, this idea that all carny's are horrible people that will screw you over... sounds a lot like the royalty is superior boop. This constant hate on for carny's feels like its an extension/symptom of the royalty thing. King PosBrake is out to shake the notions that this world was built on; like the traditions and rumors that keep the carny's and predictamancers out of work.
I think i'd be disappointed if Posbrake is wrong