It's the same with governments and political parties. One group wants it done one way, another group wants it done a different way, and so two parties, styles of governing, blockchains emerge.

My main point though is that we tend to place too much emphasis on how much new tech can help solve age-old, human nature driven problems.

Our first step should be replacing first-past-the-post voting with something that isn't mathematically guaranteed to result in a polarized two-party system.

something like https://en.wikipedia.org/wiki/Instant-runoff_voting?

IRV has the problem where gaining support can actually cost one the election (nonmonotonicity). From http://zesty.ca/voting/sim it seems that approval voting would work reasonably well.

I guess in the same way everyone in the United States can run for president, and with enough like minded people, win the elections.