Part of living in a society is compromise. I don't believe that certain stretches of road close to my home should have a 50kph speed limit, but when I get a ticket I also accept that I'm in the wrong.
If you're of the opinion that drawing children having sex (assuming again) shouldn't be illegal, you should be lobbying/advocating for that position. Changing the compromise. Otherwise you're, like me driving too fast, at the mercy of the justice system.
Laws don't require your personal conviction to matter. Sometimes we don't get to do something, even though we personally believe it to be perfectly acceptable.