Your Client Has Narcissistic Personality Traits

As someone going through an unnecessary lengthy divorce, I'm curious to know for those of you who are family law attorneys, how do you have the conscience to represent someone who repeadetly lies in court, manipulates, gaslights, someone who was abusive to his wife, and doesn't even care about the kids--how do you have the conscience to represent people like this that purposely torment? There are attorneys out there like in my situation that further add to the abuse (post separation) and purposely make the good parent's life a living hell. I'm even more surprised that there are women attorneys that do this (representing the men), when all the facts and evidence are against their client. This is an honest question I've been asking myself and would really like to know why besides just making $$.