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Don't use due to as a preposition meaning because of. Due, as an adjective here, is used correctly only when it qualifies some noun: His delay was due to an accident.
Miser i s a noun, and we can't use it as an adjective. The adjective is miserly: She was miserly.
Fool is a noun, and requires the article when we use it with the verb to be. Foolish is an adjective, and can't be used with the article after the verb to be.
A fool or a foolish person doesn't mean an insane person, but one who acts thoughtlessly. We tend to use silly or stupid instead of foolish in modern usage.