They could, but they won't. And given a voting system of UKIP 40%, BNP 40%, Lib Dem 20%, you'd have me voting UKIP, much though I dislike them, because the thought of a BNP government would terrify me.
People vote for a variety of reasons - and a large part of that for many people is to influence the government which gets elected. Many people view a vote for a party that has no chance as a waste, and it puts a lot of people off of politics and voting in general.
Plus, of course, there are many candidates I kind of want. There's no one "right" candidate for many people - there are candidates that they prefer in different ways. Giving people the chance to express that, rather than picking one strikes me as sensible.
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People vote for a variety of reasons - and a large part of that for many people is to influence the government which gets elected. Many people view a vote for a party that has no chance as a waste, and it puts a lot of people off of politics and voting in general.
Plus, of course, there are many candidates I kind of want. There's no one "right" candidate for many people - there are candidates that they prefer in different ways. Giving people the chance to express that, rather than picking one strikes me as sensible.