Should lawyers be emotion-less in order to be objective?

Answer 1

Not necessarily.

The defense attorney's responsibilities do not require objectivity. Of course, if the defense attorney can objectively prove that the defendant is innocent, it helps, but most defense attorneys are well-aware of their client's guilt. Their responsibility is to get the defendant the best deal possible, which many times requires them to appeal to the emotions of the judge, prosecutor, and jury.

The prosecutor should be a little more objective. The prosecutor is expected to provide tangible evidence that the defendant is guilty beyond a reasonable doubt; however, the prosecutor, too, may appeal to the emotions of the jury. You'll commonly hear prosecutors make remarks about the victim's personal life, representing them as an upstanding person, thus making the jury more likely to convict and the judge more likely to sentence strictly.

Both should show SOME objectivity; however, if they're acting "emotion-less", they would not be adequately doing their jobs.

Emotion-less objectivity is better suited for an investigator.