One of the main problem with most political groups, is that many, of their members will be very open-minded when it's convenient, but extremely close-minded when it goes against their PoV.

That's why, in a debate, nobody is trying to make the "other side" change their mind, it's not ever gonna happen, because both sides are absolutely convinced to be 100% right. Instead both sides are trying to convince the people listening to them that they're right.

In your case, trying to approach a political group with diverging opinions, no matter how many fact, studies, and numbers you bring with you, it won't change their view. You're simply going to engage in a fruitless debate.

If you want to help your friend, confronting that group is not gonna help, what you should do is talk to this person, and this person only, and try to reason with them. If they're not too politically oriented, they might listen to what you have to say. Don't forget that if they decide that they don't want to listen to you, there's not much you can do. 

The only way anyone decide to change their political views, is not when they're confronted about it, but when they decide to do so.