Fair, I think its normal to be more aware of issues in the media we consume. We read manga, a japanese medium, so it is normal to see japanese problems from them. I'm sure if we read american comics or korean manhwa, we'd hear about their problems as well. One might be more aware of Japanese...
Bro this was like 3 months ago, this must have really bothered you.
And the point is that is that its not solely a Japan problem. Underreporting regarding child abuse is a global problem.
Africa and the middle east have it the worse but it happens everywhere and you don't hear about it at all...