"Used car salesman meets Jehovah's Witness" approach to talking about issues can work for larger injustices, but doesn't generalize well when everyone wants to air their personal grievances. Pushing a message onto every possible forum isn't going to help much, but is sure as hell going to grow divisions and just tire people out.
And people who say that haven't noticed that the "self-destructing" is going quite well by itself, and that some guilt-trip is actually needed to avoid it...
E.g. the division between the civil rights people and those that wanted a segregated society.
Or the division between the anti-war movement in the later sixties and the "patriotic" pro-Vietnam war establishment.
Else, the bipartisan consensus (or small differences) just leads to the incremental management of what's there, and no real initiative for change (e.g. like the last 3+ decades regarding the environment or inequality).
And people who say the above are ok with the established politics, no matter how horrible they are.