How can we as a society move past things if we don't talk about it? He admits it was wrong. It was 30 years ago. The fact it happened and nobody knew means if he said nothing, he'd still be fine. But he is the same person and now getting shit from people. What if someone else is on the wrong path and wants to speak up about it? They'll take one look at how Liam was treated and say "fuck that" and stay a closet racist or whatever.