It's hard to convince someone of something, if they don't want to listen in the first place. They'll say, try to convince me, but once you start talking, they metaphorically shut their ears and go 'la. la, la, I can't hear you!' But part of the problem is that they are denying that they are shutting thier ears in the first place, claiming that they are 'open-minded' and are 'un-biased'. Yeah, right. If I know that you do not want to hear what I have to say, and I know that shoving my ideas down your throat are going to push you farther away, why even open my big mouth? Try arguing with someone who feels they are absolutely in the right, and NOTHING you will say will change their mind. Maybe over time, as life passes, they'll realize that it was not as they thought, or they'll continue believing that they are right. Changing people is difficult, and the first step must always be, that the person themself wants to change, and wants to be convinced. Otherwise, you might as well be banging your head against a brick wall for all the good you do. It's incredibly hard to just stand by and watch someone you care about ruin thier life, but if they don't see it, if they keep denying it, there is nothing you can do. And one of the worst feelings in the world is just standing by, knowing you're absolutely helpless.