I personally think it's a combination of both. It is because of their pride that they did not listen to wise counsel, and because of Morgoth's will that the path they took turned to be as tragic as it was (you know, not every time that you do not agree with a wise person you end up falling such a long way to such a dreadful end).
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You passed from under darkened dome, you enter now the secret land. - Take me to Finrod's fabled home!... ~ Finrod: The Rock Opera
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