You make a pretty good point. There has been a shift in the tribalism. I would conjecture the tough political divide comes from our 24 hour news cycle. News on both sides has devolved into a reality TV version of true reporting. The focus is on hyperbole. Who can take the more polarizing and outrageous stance. Unfortunately, if you watch the television or mainstream internet news you are almost forced to choose a side. And the choice of a side (tribe) is going to be extreme because that is how the information is presented. This causes the divide to be so drastic that friendly conversation or sharing of ideas is not possible.
I think there is hope. People are smart. People are starting to realize the masses have been brainwashed. So you posed a question, can we have meaningful political discourse that transcends ideologies. Yes, I believe we can. It needs to come from a spot of loosely held thoughts. "I think this because this..." A thought is something that can be changed and learned from.
It can't come from a place of belief. "I believe this because I'm a good person."
So, I see that being done between individuals. I'm not aware of a platform for that type of discussion currently, but hey, Steem is as good a place as any.
Why don't you write up a post about it .
Cheers.
RE: Why we shouldn't "unite"