Stating that we have such a separation without explaining it fully, and initially, is not a disservice. It's a starting point. The follow-up is 'why'. It's a logical progression from 'there is' to 'why there is'. This doesn't always work either, as we seem to be expanding what we know all the time.
Every 'side' does this. Yay for the observation and everything, but if you stop there, and take simply an accusatory approach, then you are neglecting the 'why' you're advocating in the paragraph above.
Why does the body politic push talking points and ideology rather than history?