Why Does Japan Blur Adult Content?

I heard they have a law not to show obscene content. I guess the
makers blur it so they don't break the law and stay legal, but what's
the point of that law if they are still making it? All it takes is one
blur to stay legal?
Is the government stupid? Why aren't they taking action if they have
a law against it, or should they just remove the law entirely if they
don't care?
Because what is that blur going to do? The makers still make it, and
gooners still watch it anyway. It only ruins their experience