1.The jury made its decision.
The speaker is seeing the jury as a single entity, because a jury gives a collective opinion, a single finding as to guilt or innocence.
2.The jury were divided in their opinion.
Here, the jury is being referred to as being made up of individuals, the twelve people who comprised the jury, since the opinion of these individuals was divided, and they could not, as a single entity, enter a finding one way or the other (if all members had to be in agreement, as opposed to a majority decision (10 or 11).
The most common form of the expression is, "There are none so blind as those that will not see." While some may think this comes from the Bible, it is a rephrasing of the essence of something found there, so we don't have an authoritative reference, such as the King James' Bible.
Colloquially, you will hear people say something like, "We're as good as them!" when grammatically, it should be 'they": "We're as good as they are."
So - best advice: if speaking just to friends, use the short version and say 'them'.
In a formal situation, use the long version and use the nominative form of the pronoun - after all, saying "We're as good as them are" is worst of all!
And in this corner we have Ernest H, user and defender of the King's English, and in the opposing corner, a New Wave American (and probably a Republican), Charlie B.
Hopefully*, folks, this will get ugly. The crowd favourite, Ernie, opens with a sure use of 'whom' which Charlie B. parries with a quick duck and a ...yes... it's a period...and a rephrasing.
No real fireworks yet, folks.
I've done enough postings on 'regretfully' versus 'regretably', 'hopefully' versus "I hope" to know what I"m doing. Give me some slack.