If you just want to deceive, withhold information, put yourself in the best light possible and flat out lie about the bad parts, it seems to me you ought to go to law school instead. (no offense to lawyers - they get paid to do this for their clients.)
You are perpetuating an absurdly false stereotype about lawyers here. These stereotypes were derived back in the day of Shakespeare, and were questionably true even then. Lawyers absolutely do not "get paid to lie for their clients". It is unethical to lie in court or under oath or to opposing counsel, and a lawyer who does or counsels this can and often will be disbarred, suspended or fined. You actually cannot lie as a lawyer as freely as you can as, say, a doctor or other professional. There are seriously enforced ethical canons and professional rules limiting this kind of action. And as a lawyer you are far more sensitive to the "rules" because troubleshooting is your stock and trade. I'm afraid you are buying into a hollywood portrayal (think "Liar Liar") of lawyers that simply isn't the norm. It's about as true of lawyers as the daily sexcapades of Grey's Anatomy are true for most doctors.
Lawyers do present their client in the best light supported by the facts, but you do that in any field. And in terms of criminal law (which constitutes a VERY SMALL percentage of lawyers and is not representative of most), lawyers generally don't want to hear from the client whether he was guilty or innocent, because, given that they are
not allowed to present that which they know is a lie, it is usually better off not knowing if the client did what he is accused of. Once you
know he is going to lie, you aren't allowed to let him testify. So yeah, in that small segment of lawyering, you
intentionally stay ignorant of the truth specifically so you cannot lie about it. But otherwise no lawyer in his right mind would ever knowingly lie to a judge, jury or in communication with other lawyers, because you totally can lose your license for that. Please check these stereotypes at the door unless you also are willing to welcome all the false but unflattering stereotypes folks have against doctors and other professionals.
Bottom line, the ethical rules governing lawyers are far more elaborate and more specific than for any other profession. You can't talk of doctors having ethical obligations and then say lawyers are unethical in the next breath. Lawyers actually have rules that they have given teeth, doctors don't. Lawyers regularly and frequently suspend, disbar and sanction their own for stepping across the line, physicians pretty rarely do. So far more lawyers stay on the straight and narrow than doctors as a consequence. If you are looking for unethical behavior you will find more of it in nearly any profession, I'm afraid.