@Mike-KayeSOL used to make communicating via email fairly simply, but the new SOL 'messaging' killed that capability. While you can opt to have your SOL messages displayed via email, any 'return messages' will be forever lost, as there's no one tracking incoming messages to the automated system.
Basically, if a commenter doesn't want to be identified, there's nothing you can do, which is why so many suggested inviting them to register their objections with a story via email, so authors can discuss it. However, as expected, this frequently doesn't accomplish much.
It's similar to most media outlets nowadays, which allow users to heap abuse on others with virtually no safeguards other than the 'we're monitoring the abuse', which typically goes nowhere at all. They choose to shelter abusers, to stir up debate, rather than protect their core users.