I'm unclear whether you're arguing that obscene/pornographic material should be accessible/distributed to minors as the distinction here is that this activity is in fact a federal crime in the US (and most of the world).

The government unequivocally has the right and obligation to enforce federal law. To what extent and by which mechanisms they should do this is a different question altogether but this issue is hardly about 'dictating what other people can do with their own lives in their homes' as was the case with other laws like anti-LGBT.

> If your moral code dictates what other people can or cannot do with their own lives

That's literally the point of law. One person writes the law, and it dictates what others can and can't do with their lives. Are you an anarchist? Or are you just not thinking clearly about what you are saying?

If thing X demonstrably causes major harm to individuals, then it is often in the purview of government to restrict adults from exposing minors to X.

And, yes, you might want to take a look at your moral code to see if it's a bit broken. I think mine is operating fine!

Like viewing child porn?

Clearly this is too reductive. For example, my moral code says you shouldn't murder people in your home.