By the way, you mentioned "common Western laws". Okay, let's take a look.
Western countries that ban lolis, and convictions have happened:
- Australia
- Canada
- Ireland
- New Zealand
- United Kingdom
Interestingly, they're all Anglo countries.
Western countries that do NOT ban lolis:
- Austria
- Belgium
- Bulgaria
- Croatia
- Cyprus
- Czech Republic
- Denmark
- Estonia
- Finland
- Germany
- Greece
- Hungary
- Latvia
- Lithuania
- Luxembourg
- Malta
- Netherlands
- Portugal
- Romania
- Slovakia
- Slovenia
- Spain
- Switzerland
- United States of America
Western countries where lolis are a gray zone:
- France
- Italy
- Poland
- Russia
- Sweden
Western countries have traditionally had a strong culture of freedom of speech, and freedom of artistic expression.
This is reflected in the fact that non-Anglo Western countries don't ban lolis.
So perhaps these anti-loli laws are not as common as you seem to think.