Not quite. The role of the defense is much as you describe; to advance every conceivable argument, etc. The role of the prosecutor is intended to be a seeker o

Not quite. The role of the defense is much as you describe; to advance every conceivable argument, etc. The role of the prosecutor is intended to be a seeker of truth, however, which doesn't always mean aggressively seeking conviction. In practice, however, your description is accurate; it's a rare prosecutor that doesn't pull out all the stops in an effort to convict, regardless of the evidence.