He didn't have a judgment against him. The case settled before it went to court because the Ramseys couldn't prove that he was wrong. The Ramseys solicited the settlement. If anyone has lost any credibility, it's the Ramseys. They claim they only want to clear their name and aren't bothered about the money but settle against ST (or rather his publishers' insurers mainly) rather than risk losing in court and sue Fox, pretty much the most affluent broadcaster on the planet and part of the Murdoch empire, while ignoring Dr Wendy Murphy's accusations and her plea that the Ramseys do in fact sue her.
My theory is that ST would have been quite happy to go court since a civil case where she had to prove that ST's position was wrong was probably as close as she'd ever get to being tried. He actually discussed with a high profile lawyer (whose name escapes me) the possibility of suing the Ramseys in a civil case for the wrongful death of JBR and was advised that he wasn't an interested party so he couldn't. The same lawyer ended up on ST's legal team to defend the Ramsey action. Do you really think that, between them, they couldn't have faced court? Of course, ST did agree to settle, but his life had essentially been suspended for five years and I, for one, don't blame him.