Earlier quoted context omitted.
I'm somewhat sympathetic to that argument. However, it doesn't stop there. Violent video games prove contribution to market demand for FPS-style videos of mass shootings or carjackings, so can/should we ban Call of Duty and Grand Theft Auto now? (Note that the "market demand" argument is subtly different from the argument that the games directly cause people to become more violent, either in general or by encouraging…
Tell us more about the market that is carrying out mass shootings/carjackings with intent to sell the imagery of it. This is the first I've heard of it. In fact, when mass shootings do occur they are usually explained away for some other reason (e.g. a troubled teen who went off the rails), not that it is the day-to-day operation of a videography business.
The link between consumption (without purchase) of CSAM and increased production of CSAM is assumed in the same way, isn't it?
The motives and situational dynamics of pedophiles filming child pornography, and gangs robbing or carjacking people on video in broad daylight, may be different in some ways, but in some ways they're not: both get direct benefit from the crime, regardless of the recordings; in both cases some (small) subset of people interested in watching the recordings may become more inclined to act out what they see, if it aligns with an already existing inclination toward pedophilia or violent crime. That's independent of whether they can make money or become famous for the crime, although money or infamy as additional motive is an additional problem.