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The point is that both of them are ultimately only drawings, and that for a lot of people there is obviously a gap between being aroused by the hentai version and wanting to do something like that irl.
> And no one goes from watching regular porn to looking at drawn children in sexual acts.
You easily can. As soon as you get into Hentai, you will very quickly find characters of questionable age (or rather non-specific age but it still takes place e.g. in High School or is about a "little sister" or hentai about a fictional character that is canon underage...). From there it's a small leap.