Actually, he brings up a valid point.
Destroying Pica's golem does nothing to Pica, he doesnt even feel it.
If Pizzaro feels the damage done to the island, he is indeed a worse version of Pica.
However, he can always be paired with a guy who has low DC so that damage wouldnt bother him much.
If he is facing a high DC opponent, this probably wouldnt affect him and damage to island wouldnt transfer to him.
In the end, his performance depends on the island's size and the size of his constructs.