If social media required ID, you could maintain the freedom of being able to use these tools for anything legal, while swiftly detecting and punishing illegal usage. IMHO, you can't have your cake and eat it too: either you want privacy and freedom but you accept people will use these things unlawfully and never get caught, or you accept being identified and having perpetrators swiftly dealt with

Same is true outside of the Internet. With cameras and face recognition everywhere, criminals can be swiftly dealt with. At least that's what people tend to believe.