It isn't hard, it's impossible.
Progressives do not care about facts, or logic, or law, or anything other than winning. Win at all costs, no matter the consequences. This spans from the top of the party, all the way down to the lefties here arguing at USMB. All that matters is the win. They will lie, deflect, troll, and whatever else it takes EXCEPT listen. that they will not do.
Think that is just a right winger hating on the left and exaggerating? Well, consider the cases of Trayvon Martin and Robert Brown. The progressives argued relentlessly, without knowing any facts in the case, without caring about the law, that George Zimmerman was guilty and Darren Wilson too. Dozens of threads later, after they all swore that Trayvon was shot for no reason, and that Wilson shot a fleeing Brown in the back, they trials are over and we know that nothing they claimed was true. Did any of them acknowledge that they were wrong? No. In fact many are still maintaining that Zimmerman and Wilson are guilty to this day. Despite the fact that our own Justice Department, run by a black man with a huge chip on his shoulder, couldn't find a case to charge either of them with ANY crime at all, they still are too immature to admit error.
If you do try to discuss anything with them they will try to drag you off topic, they will ask for links and proof that when you provide it, they will call it bogus. And even if they are so totally off base that dozens of people show them to be wrong in one thread, they will disappear and show up in some other thread at a later time saying the exact thing that you just debunked.
Discussing anything with a progressive is a waste of time. I have no respect for them because respect is earned and they have only earned disgust.