Because we can’t talk to each other

The humans versus the buggers. This is the central conflict in Ender’s Game. As to why it exists:

“‘Why are we fighting the buggers?’
‘I’ve heard all kinds of reasons,’ said Graff. ‘Because they have an overcrowded system and they’ve got to colonize. Because they can’t stand the thought of other intelligent life in the universe. Because they don’t think we are intelligent life. Because they have some weird religion. Because they watched our old video broadcasts and decided we were hopelessly violent. All kinds of reasons.’
‘What do you believe?’
‘It doesn’t matter what I believe.’
‘I want to know anyway.’
‘They must talk to each other directly Ender, mind to mind. What one thinks, another can also think; what one remembers, another can also remember. Why would they ever develop language? Why would they ever learn to read and write? How would they know what reading and writing were if they saw them? Or signals? Or numbers? Or anything that we use to communicate? This isn’t just a matter of translating from one language to another. They don’t have a language at all. We used every means we could think of to communicate with them, but they don’t even have the machinery to know we’re signalling. And maybe they’ve been trying to think to us, and they can’t understand why we don’t respond.’
‘So the whole war is because we can’t talk to each other.’
‘If the other fellow can’t tell you his story, you can never be sure he isn’t trying to kill you.’”

This exchange compels me to consider our own intra-species conflict. How many disputes are down to our inability or unwillingness to communicate, to our lack of empathy and forgetfulness? How many fights are caused because masters don’t remember what it is to be an apprentice? What damage is brought about by the old forgetting what it is to be young, the haves forgetting what it is to be a have-not, and the cynical forgetting what it feels like to have hope?

Put more succinctly: are all the ills of the world caused by fragmented communication, by a deteriorated empathic ability and our unwillingness to imagine ourselves in any role other than the one we currently occupy?