Would you have moral objections to defending somebody you knew was guilty? Especially if their crime was something horrible? I know I couldn't do it. I couldn't live with myself if I knew somebody was free because I was able to convince the jury that they were innocent. I would even have a time fighting for a reduced sentenced if I knew the person was guilty. Lawyers are required by law to keep secrets. If their client flat out describes a list of murders they committed, they would lose their lawyers license if they revealed that to anybody. Instead they have to fight for that person, all while making huge amounts of money. If you were a lawyer would you have trouble with defending people you knew were guilty?