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From an American perspective, it's because we have no choice. What you have to realize is that, in the US, third parties do not have a foothold.

Yes, we can vote third parties, but this point always comes up at the presidential election and by then it's too late. If I just vote third party, that's how people like Trump make it to office. What we need is third parties to rise up naturally through local and state politics. Then, and only then, can we humor it at a federal level.

The main issue is that Americans are just not involved enough in local politics. Most Americans only vote during the federal elections.