Yes, bigotry IS always sinful. Opposition to criminal acts, however is NOT bigotry and NOT sinful. Those who oppose the immigration of hispanics because of their race or national origin are, in my opinion, bigoted and wrong. But that is NOT what most conservatives are troubled by. We oppose the illegal crossing of our borders, for whatever reason. It is a felony, and ignoring it is wrong.
Yes, bigotry IS always sinful. Opposition to criminal acts, however is NOT bigotry and NOT sinful.
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I would also add that opposition to sinful acts is NOT bigotry.