Some people will never WANT to 'get along'. They cannot see, and don't even care to see, beyond their own circle of concern.
Some people will only believe what they are told to believe and think what they are told to think.
Some people are deeply ingrained with hatred and ugliness, and some people are deeply ingrained with compassion and positivity.
It's just a tough nut to crack to bring some folks to the point of seeing things as others see them, and feeling things as others feel them. Some will get a sudden light bulb, some take years, and some never will.
I think those things apply to all different kinds of 'getting along' on all levels from the most rudimentary to countries getting along and, of course, the two rival towns with basketball teams will be in the middle somewhere.
I guess in all of this I just wish more people could have some inkling of how things feel from the POV of others - to understand how, from the most fundamental level of experience, things really feel for somebody else. I see so many things written, and hear them spoken, by people who just honestly have no idea that things are experienced so differently by others. They don't even know that there are different POVs, only their own. Some don't even CARE to know what it feels like to be somebody else.
Yikes! I could go on but then it looks like I already have. 