Attorneys were made to swore an oath to defend their client to the fullest of their ability, regardless of whether their client is guilty or not.
If, I acted as the defendant's attorney, I would try everything in my power to discredit the eyewitnesses by making them look less reliable in front of jurors.
I would tell the jurors that unless the accuser provide a hard evidence such as video or picture, the eye witnesses might've been bribed by the real culprit to provide false statement to the court.