I certainly don't think violence is the only possible resolution for conflict in general. What I mean is that violence is the only way to resolve conflict that does not depend on generating consensus. That makes it the default. A conflict means that two people are on mutually exclusive courses, so some resolution is inevitable. If they don't communicate and come to a consensus to resolve the conflict, the resolution will be violent.
There can be no peaceful coexistence without ethical consensus, because denying the existence of conflict does not resolve that conflict. This is also my problem with "anarchy without adjectives". If we don't work to build consensus on ethics for conflict resolution, violence is the fallback method of resolution, primitive as it is.
I'm also very optimistic about EOS (and decentralized consensus technology in general) as tools to revolutionize how humans collaborate and build community.
I'd argue it's the default because it's all people know innately. It's part of our primitive animal nature. That said, if it doesn't get us the results we want, we may use other options because we are an adaptive species. The link in my last comment has about 30 minutes worth of videos on NVC you might find quite interesting. The inevitable resolution you mention will be violent without communication, I agree, but the world is more connected and humans are communicating orders of magnitude faster than at any other time in our existence. I'm hopeful we can change and I use evidence of the change we've already made to encourage me about the future. Reading books like The Better Angels of our Nature or watching videos like this give me optimism:
And yes, I agree. That's why I've posted a bit about morality quite a bit on Steemit here, here, and here.