"So, 600 economists (or 500 lawyers, or 1,200 business leaders) said X about Brexit? Well, we've found a couple that say Y. And since Y supports our world view, they must be right. Stop ganging up on them, you bullies!"
Now, a lie can be repeated a million billion times, but repetition will never magically make it true. (It just makes it harder for the truth to be heard).