It's called the utopia fallacy, or nirvana fallacy.
http://www.claremont.org/crb/article/the-utopian-fallacy/
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It's called the utopia fallacy, or nirvana fallacy.
http://www.claremont.org/crb/article/the-utopian-fallacy/
Also that was obviously a question, indicated by both the phrasing and punctuation.