If it's not disrespectful for Arnold to not say it, then it would not be disrespectful for everybody else to not say it -- IOW, to not have the pledge at all.
That's why I disagree with you. If you're too good to pledge allegiance with the tongue, the hand over the heart is a hollow gesture.
Its your choice, you can say it or you dont have to say it. But it isnt disrespectful if you dont say it. Again as long as your right hand is over your heart its fine.