Seth Godin nails it (again):
The reason it's difficult to learn something new is that it will change you into someone who disagrees with the person you used to be.
And we're not organized for that.
The filter bubble and our lack of curiosity about the unknown are forms of self defense. We're defending the self, keeping everything "ok" because that's a safe, low maintenance place to be.
The alternative is to sign up for a lifetime of challenging what the self believes. A journey to find more effectiveness, not more stability.