People looking at child porn doesn't harm you, but it's illegal.
Yes, that IS illegal indeed, but who says that the legality of any practice pertains to its moral/immoral value? Pharmacutecal companies pump out drugs that usually hinder people more than they cure them because they only attack the symptoms, not the causes--and yet that's legal.
I find child porn sickening of course, but people looking at child porn still doesn't harm YOU so why should you care? Unless of course it was your own kids or kids that you actually knew of irl.
Once again, as long as these pedophiles are only looking at the stuff and not actually raping children, that takes a little weight off the issue. The core issue is more on the sickos who are snapping those shots of naked little children, THEY're the ones doing the real harm. They're the ones robbing them of their innocense and immortalizing the very image of that robbery for other sickos around the world to see.
It goes back to bestiality. The issue are the perverts capturing animals in the act to record them out of their own sick pleasure, or even worse when humans are involved in the act and *eww I'll stop right there*---sure you can judge the hell out of the people who stumble upon that kind of pornography and enjoy it, but that's just attacking the symptom rather than curing the cause. The cause being of course the sickos who provide it.
What's my point? You're still not the kid getting molested.
At the end of the day, there are too many things happening around the world for any of us to really control or have the capacity to care about. We all have our own concerns, so to add onto them by concerning ourselves with what other people do with their time is just a waste of your time in itself.