Step by step, researcher looks for sexuality clues

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If people "are going to think what they always thought anyway", and no one ever changes their mind, then society would have the same viewpoints as it did 100 years ago, or 1000 years ago. Our society's opinions have actually grown and changed very fast in this century, alone, regarding various types of human rights issues.
So, to say that studying something is useless and that everyone will think what they were going to think anyway is simply not true. Society's attitude towards gay people has changed remarkably just in the past 30 years. That didn't happen in a vacuum, it happened because of learning and the spread of information. Some studies and information are more compelling than others, but I would hardly call studies "useless". If no one ever looked for things, studied things, and shared the information, where would gay people be today? Or anyone?