When megabillionaire Elon Musk drove a global advertising activist group out of business this week, he was putting Donald Trump’s tactics into practice. And both men are teaching a lesson to conservatives everywhere: When the right goes on the offensive, the left flees the field. In the Musk case, the owner of the social media platform X declared open war on an outfit most Americans had never heard of but was wielding pernicious influence over their lives — The Global Alliance for Responsible Media. In a post on X to his over 193 million followers, Musk publicized an announcement that X had f…