Because we love being entitled to our own opinions, and we love acting like babies when we're exposed to one that we don't agree with. And we hate babies.
Now, with that note of snark out of the way, to address your last questions - the culture in which we live hails the victim card, and in order to assume the role of the victim, you have to adopt a sickening degree of self-defeatism. "Poor me, pity me, now listen to what I have to say, because what's going on with me will happen to you too."
And really, the only way I can see to fix it is to call out the defeatism when it happens. Don't let the pity party get to you. Case in point? Look where we're talking about this. On a forum dedicated to people who enjoy a children's game. We can whine all we like about the political landscape and how it's going to kick us all in the rear, but every time someone complains about it on the Internet, all I can think to myself is, "Look at the resources you've been able to afford in order to even present your argument to these people. I've been to an orphanage that knows NOTHING of the Internet or, really, the world at large, and the very first thing they asked us to do was take them with us. Poor you? Pipe down!"