[okie01]

But if it's not true, then Cain should be able to successfully show some kind of facts that counter the lies.

If they are indeed lies, how does one do that, exactly?

If it never happened, what kind of "facts" would convince you otherwise?

[PapaNew]

This accuser is obliged to get down to exact who, what, where, when, etc. and somewhere in there will be a fabrication he should be able to blow a hole through (probably a few holes at least).