Does anyone think He bought the jury or threatned them?
No. The mother of the accuser is a professional litigator.
Jackson is, by his own admission, a pedophile who sleeps with little boys and plies them with alcohol. But mama's own weirdness was just enough to counter Jackson's weirdness, to these jurors.
Sneddon also acted like Captain Queeg against Moby Dick (no pun intended), and his desire to somehow get Jackson, any way he could, did him no favors.