You'd think a country that played a central role in a global, decades-long unstable regime of bipolar power that routinely pushed mankind to the brink of nuclear oblivion would know better than to have a bipolar electoral system
have you never heard of the many times we almost came to setting off full scale nuclear warfare because of the bipolar power war of the ussr v usa et.al.?
the only thing that saved us was cooler heads that prevailed on both sides.
Why would throwing more actors with similar capabilities into the mix make the situation any more stable though? That seems like basically the old European Balance of Power, which broke out into open conflict more frequently.