It's Valve's website, what they say goes. Pedophilia should not be tolerated in any way. Honestly Valve should have had it to where they track this games purchases and report them to authorities. That being said, depends on how much you want controlled and regulated or not.
Somehow that moral outrage in your words and your avatar picture really confuse me.
Report customers to authorities for purchasing a game on their platform?
Wow... just wow...