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spurgeonryan said:
No need. It is not only Man made reasons.

Your wording is a little unclear. Are you saying that "man-made reasons aren't the entire reason"? If so, then true - man-made reasons are merely one factor. But they're a large factor.

If you're saying "Man made reasons aren't true", then again, I ask you to actually look into the real research, rather than starting with your own opinion and assuming that real experts are stupid.