I can understand the point of view. In a world where they produce children's toys based on adult videogames, there is always going to be content that crosses the age boundaries and make it difficult for parents to cope with.

Disappointingly, she isn't their audience probably because her demographic don't buy enough comics or comics of the right theme. The same could be said for people with Wheat / Gluten allergies in most shops, which is why they have little or no products available in most general stores, because they aren't a big enough demographic to make money out of.

Those comics weren't aimed at her (due to the age rating), which meant that they shouldn't have been a factor. I'd also be curious about which Batman comics were actually suitable for his young son. What should have been a factor was the lack of content available for his daughter (which was mentioned), instead of the focus on the unsuitability of content which isn't even aimed at her. Too much focus on his daughters age and older themed comics.

I would have sided more with the author if they spent more time researching and promoting alternatives and encouraging parents to be more careful with the content they children are consuming (due to the closely related adult versions).