There is no actual dispute about the wrongness of rent-seeking, the only people who might think otherwise are either misanthropic Machiavellian jackasses who are themselves wrong or people who don't know what rent-seeking is. It's like saying "that's only wrong if corruption is wrong." Well no kidding corruption is wrong, does anybody actually want to dispute that or are you just asking for a link to the collected works of John Locke and Thomas Jefferson?