I have seen just about every misinformed, incorrect argument against MMA. What annoys me the most is that most of hte people who try to argue against MMA just, flat out, do not have enough knowledge on the subject to make valid points against the sport.
CagePotato's write did a great response to a newspaper editorial
that bad mouthed MMA. Check it out, the editor perfectly breaks down why most arguments against MMA are not very thought out.