>

That makes sense to me. Use latin plural for uncountable data, but the english plural for countable datums.
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Please note that a change of view doesn't necessarily mean a reversal, or that the conversation has ended.
^Delta System Explained ^| ^Deltaboards >

My fourteen points of data are no longer valid. >

!delta
Well, that was easy... I clearly didn't think enough to specify the explicit pluralization from a previous word. >

Data itself is plural. Datum is the singular. 
Is and are both are correct >

But then "datums" are a thing. >

Yes, but datums refers to multiple single pieces of information in isolation and data refers to a collection of information.  Just think of it this way: you cannot have "a data", you can only have "data".