Duverger's law makes campaigns devolve into undermining and destroying the competition, with the two parties hosting primaries to see which of them can "turn the wheel" the hardest before the general election where they claim "don't worry I won't crash the car!" despite their prior incentives.

If we used plurality voting for the inputs to a decision problem that follows the classic tragedy of the commons, we'd see a similar result. If instead of just {+1, +0, +0, ...} without repeats, we instead voted with {+1, +0.5, -0.5, 0, 0, ...} cooperation (or at least constructive competitive frameworks) would at least be at parity with destructive and potentially mutually destructive competition.