Re; Lawyers lying
Let us imagine that you were accused of a crime, or being sued. If you were very clever, and knew all the legal rules, you could actively defend yourself. You might know that a oral contract under certain conditions is not binding. You might know that someone relaying gossip heard from someone else is not admissable evidence. You might know a hostile witness who is being threated or bribed can have their testimony disregarded. You might know that you aren’t guilty because the crime requires an intent do something illegal, and your faults were accidental.
However the average person doesn’t know the rules, and they will get steamrolled. They will be sued over things that aren’t the proper basis to be sued over. They will be accused of crimes they are innocent of. They will lose due to witnesses whose testimony is unreliable and is biased.
In a traditional Beis Din, the judge will take notice that the law is being ignored and justice is being perverted. In most circumstances, an American judge will only do something if the party speaks up. The American judge is more of a referee between the two sides. Since most Americans don’t know much about the legal system, they won’t know to speak up, and will forfeit their rights. That’s what the lawyer is for. It’s quite honorable.
A lawyer who lies to the court will risk losing his license.