It's not about 'unrealistic expectations', we're just hyper-aware of how bad the world is, that does something to you when you're exposed to it from childhood.
Related to this; is not that the world is that bad (even tho it really is in bad shape), the thing is that the massive hyper-load of information is only growing and know we instantly know more about the shit that is happening worldwide when decades ago it would take even days for you to know about the war on the other side of the globe.