Idealist:
1. One whose conduct is influenced by ideals that often conflict with practical considerations.
2. One who is unrealistic and impractical; a visionary.
Having ideals is obviously to be encouraged BUT ware of idealists! However soft and fluffy they might appear to be - and indeed some are - there are many others who will happily torture and kill in order to impose their unworkable philosphies onto an an unwelcoming populace. 
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