It's how America has come to work, but I don't believe it was designed to be that way. In any case, we should aspire to more. Thrashing back and forth, with each side passing half-assed initiatives that are undermined by the other when the get back in, is pointless. When you look at major, lasting changes to society (Social Security, Medicare, etc. ...), they all had bi-partisan support - at least some. At least enough to last.
We're divided into two bitterly opposed camps by an antiquated voting scheme that wasn't designed to deal with a global communications network. The lesser-of-two-evils conceit has always been the achilles heel of simple democracy, but television and the internet amplify the effects of LO2E to the point of breaking the system entirely. LO2E has many (most?) eligible voters voting for candidates they know to be bad, simply because the news tells them that if they don't, some other jerk they hate even worse will win. They are voting for bad candidates on purpose. That's never going to produce good results.
This drives the parties to focus, almost exclusively, on fear. They don't bother trying to sell a candidate on the candidate's virtues, or on a platform with broad appeal. They barely bother with a platform at all. Instead, they crank up the fear machine and demonize the opposition. The opposition is obliged to respond in kind, and we devolve into a shitshow where each party is pleading they they aren't quite as bad as the other. And the other is Satan incarnate.
I suspect that this won't change until we change the voting system. Though I can see the possibility of a candidate with the courage/intelligence to seek consensus regardless. They'd be bucking the trend in either party, but if they can get nominated, I'd expect them to win. Bigly.