The Idealist (n.) cannot be reformed: if he is driven out of his heaven, he makes an ideal out of his hell.
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Idealist (n.) refuse to believe their cause needs the same evil-smelling manure as every other human undertaking.
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The Idealist (n.) is incurable: ejected from his Heaven, he makes an ideal of Hell, and embraces his disillusionment as fervently as he once embraced his hopes.
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An Idealist (n.) is a creature with good reasons to be in the dark about itself, and prudent enough to be in the dark about those reasons too.
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An Idealist (n.) is something I've never yet met — but plenty of liars.