I guess the main concern is about how this sort of content could coerce people to attempt their fantasies in real life.

This is the very same argument that has been made about gay persons in times and regions where LGBT+ topics and behavior were criminalized. The same argument was also used in the 21st century about kids playing violent video games.

It’s also the same argument used in the 19th century to raise a moral panic about women reading romance fiction.

Here’s the relevant Wikipedia excerpt:

Cultural anthropologist Patrick W. Galbraith based his research on Japan’s crime statistics, showing that sexual abuse of minors has decreased in Japan since the spread of lolicon media increased in the 1960s and 1970s, argued that cartoon pornographic images do not necessarily influence crime.

A 2012 report by the Sexologisk Klinik for the Danish government claimed that there is no evidence that individuals that view cartoons and drawings depicting fictitious child sexual abuse are more likely to engage in child sexual abuse in the real world.