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by Spare_account 2427 days ago
Sorry, I've only just seen this. Your breakdown doesn't reflect what happened here. You would be correct if all B had said was "Support X".

What we saw above was:

A: Claim X

B: Support X, I've observed Y.

C: Support Y too, please.

In this particular case, Y was arguably the inverse of X but it was nevertheless described as having been observed many times, but without any sources.