As in the microcosm, so in the macrocosm. If you think about even the difficulty of maintaining stable relationships with the handful of people you know it's actually really damn challenging. Occasionally you have fights and disagreements and sometimes you think fuck it I just can't deal with you anymore or right now. If it's like that for everyone on Earth in their personal lives then that's what Earth is going to be like in aggregate roughly speaking.
I don't mean to be a downer about it. I just think we have a very rosy view of "the world gets better and progress gets made and that's the natural state of things". I've come to realize that that doesn't really hold up to scrutiny when you look at the history of the world over the last 12 to 13 thousand years.
As it stands this is mostly a happy accident. Scariest thing is it can all go back the other way.