Should the NeoCons face criminal charges?

Saddam Hussein was executed for crimes against humanity. However, the weapons that he used to invade Iran and murder the Kurds were all supplied to him by the NeoCons of America. This makes them accessories to Saddams crimes, the main culprit being Donald Rumsfield. Should these criminals face charges for their roles in helping Saddam carry out these crimes? Isn't it ironic that they later turned against their former friend Saddam?