The problem is that they were not on trail for stealing, killing, or intimidating. They were on trial for knowing each other and being a family. Federal power grab bullsh#t.
If you think someone committed murder, then get them on that, not some beep association.

You are supposed to cheer that even a defendant with a very bad reputation gets a fair trial. If the government fails to prove their case with credible evidence beyond a reasonable doubt then the jury will see reasonable doubt and bring in a verdict of not guilty. Or it may be that the jury perceived abuse by government agents and used that as a reason for nullification of offenses.

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these guys may be funny, loyal to one another but they were still criminals who had brought harm to the community at large. DiNorscio said he stopped giving his cousin money cos he was spending it on drugs. i have no doubt that's true and he really loved his cousin, but what was DiNorscio busted and doing time for? a drug deal. he was playing the sympathy card, and i wonder if the real-life jury was aware he was serving time for narcotics distribution. the prosecutor may be an ass, and the Feds' investigation methods, profiling techniques etc may suck, but they were not accusing the wrong people of the wrong crimes.
the fact that these guys went free, meant that justice had not been served in that courtroom that day, and the jury had failed in their duty.

Still there is a slant on this movie, the prosecutor and co are made out to be obsessive aggressive and the mobsters are all friendly get along guys, real events aside there is a spin being put on herewhich would be fine if it was all shoot outs, car chases and murder suspense or even if it highlighted some more about the criminal justice system other than it doesnt allways work.
It doesnt do any of this, it just shows the biased interpretation of a true story about a convicted drug dealer being a bit funny and helping to get all his criminal mates off the hookwhy this movie was made I will never knowit is not especially informative or entertaining and as the OP said you would guess it was funded by the mob themselves.
Even if Jackie was a great guy he was still complicit in hanging out with drug dealing, murdering scumnone of which get the just ending as they probably would do in most gangster movieseven the true ones.

first of all, the end of the op's post was hilarious. i laughed out loud.
lol.
BUT.

1. This is a true story, told from dinorcio's perspective. this is due tot he fact that it is the most entertaining perspective available from which to tell this story, so it shows him happy along with his "friends" at the end of the movie.
2. You don't have to cheer for the mafiosos. You can be upset with the system if you want to, the movie doesn't tell you what to think

It's a true story
At least, that's what I've been led to believe. I suppose we aren't allowed to make movies about the times when the mob wins?

They are mafia men, criminals who steal, kill, and intimidate people to extort them for money.
Right and they've been glamorized in motion pictures since time immemorial. What are you new?
"The Springfielders heroically slaughtered their enemies as they prayed for mercy"