I agree, mate. When all the political candidates running for positions in the government are corrupt and useless, the country is doomed. We have no choice but only to choose the “least evil” among the candidates. But when there is a candidate that is credible and capable of leading the country and we still don’t choose that candidate, the problem is in the people.
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Depending on how the electoral rules are designed, by choosing the "least evil" we are excluding those parties which may have good proposals, but we foresee that they won't win.
It's the case of, for example, a country where there are two leading candidates, one of them in the center and the other far-left or right. People would prefer to vote the center in order to make it more difficult for extremists to come to power, rather than voting a third party that has no chance of winning, but it was our favourite.