How did such a young man go to so many venues like the Oxford Union and liberal colleges? The answer is that he knew that he had the truth in his pocket.
So what can the other side do? I guess you do your best and try to lose gracefully. But the left is not interested in losing gracefully. These kids have grown up in bubbles in which their beliefs have been spoon-fed to them and have never been given a shakedown cruise. Charlie Kirk was their reality tester.