I know! Why doesn't everyone just drop everything and pay attention to the stuff that you are interested in? Seriously, do you know how ridiculously egotistical you sound? You have no idea what those people do with their lives when they leave the coffeeshop, or indeed everything that's going on in the coffeeshop. The lady with the baby might just as easily be writing a book. The barista might hate TV and be looking forward to her cello lesson or some other factor. You're judging, and dismissing, people based on your completely uninformed guesses about what their lives must be like. This is as foolish as me suggesting that you don't value the perspective of the young mom because you're incapable of forming a relationship and starting a family.
You are drowning in your own hubris, and haven't stopped to consider the possibility that that your conclusions are not well-founded. There are insane implications to lots of things, like having enough nuclear weapons to destroy all life on earth many times over. And yet we've managed to avoid doing so. Spy satellites gather up enough data to map our every move, but when we look at how much imagery there is that helps to re-establish a sense of perspective. I suggest you ask your roommate why devotes time to volunteer projects instead of posting paranoid screeds on HN; you might learn something useful.