The most insane belief that people currently possess is that we should all be miserable, despite living in what is undoubtedly the best, most prosperous, safest, healthiest, and most abundant age of all of human history. It's a cult, and its members don't even realize they're a part of it.
Was the world less prosperous, safe, healthy, and abundant in 2005? If you don't measure it in clock cycles per second?
Significantly so.
Oh, I agree. I don't think we should be miserable. We'd be a lot less miserable with less stuff and more friends. Less internet (probably), more music and hobbies. Yet here we are :)
Many of us aren't miserable, love our stuff, and love our music, friends, and hobbies! And I suspect many more would be in the same camp if they weren't being told so often that "everybody's miserable."
When people hear "the world sucks" enough times, they start think, "the world does suck", and easily enough that leads to "my life sucks". Hearing that the world is great can help have the opposite effect. But it's often derided as foolish or even insensitive not to dwell on the negative.
And no, I don't think that most people are "happy shoppers" but seem deeply disaffected about their lives, and shopping might be a compulsive behavior that helps them soothe underlying fears of dread.