Why do traditional and unconventional relationships/marriages get so much hate?

People seem to always measure the success of something by whether they personally would do it, "society approves of it," or their religion/culture, etc, but outside of illegal things, what does it matter if someone wants a traditional or unconventional relationship. You're not in it and if they are happy, so what?

Why do traditional and unconventional relationships/marriages get so much hate?
Why do traditional and unconventional relationships/marriages get so much hate?
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