Not to say I agree or disagree with this jury, but a dismissal or acquittal does not necessarily mean the case had no merit. OJ was acquitted, after all, and many, many people are wrongfully found guilty.
A civil finding of no liability is, in principal, a stronger (though still not certain, obviously) indication because the usual civil standard of proof (preponderance of the evidence) is symmetric, as opposed to the asymmetric standard (beyond a reasonable doubt for conviction) favoring acquittal in criminal cases.
Do you know something that the jurors don't? Reasonable doubt. That's how the system works.
This is weird question, because in OJ's case we know a lot of things that the jurors didn't. Part of the critique of the prosecutors in the case was that they decided not to enter a lot of material things into evidence (e.g. the entire Bronco chase).
Also, there are a lot of things that happened since then that the jurors did not know (because they didn't happen yet). He did write a book that was a description of himself committing the murders (but it is "hypothetical").
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Civil trials don't find guilt, they find liability. And, aside from the difference in evidentiary standards (beyond a reasonable doubt vs. preponderance of the evidence), the actual fact question in a criminal murder charge is substantially different than that in a civil wrongful death charge -- one can be liable for wrongful death on the same pattern of facts under which one would not be guilty of murder.