If the cause of peace is worth supporting ? and we believe it is ? then peace protesters must demonstrate the values they promote. The vast majority of the estimated 15,000 protesters who took part in a peace march Sunday in downtown Portland did just that. They were well-behaved, well-intentioned and serious about their cause. But then there was a smaller group of demonstrators ? if they can even be called that ? who engaged in numerous actions that violated the sensibilities of ordinary people and damaged the very cause the activists claimed to endorse. This splinter group of protesters...