No sense second-guessing a jury which heard all the presented evidence, but "Know your target and what lies beyond" comes to mind.
I agree, though, from what I've heard and read, that stage-whispering a warning has to stop in the case of no-knock and low-knock warrants. (Not that this was probably the case, but I guess that's partly what the OP is referring to.)
And from the PD's point of view, this was indeed a case that
had to go to trial. Just enough Qs in both directions that it
had to be settled by a jury.
Although "justice is blind," I'd like to see some representation in those scales as to how much justice costs in green dollars.
It's your $300 per billable hour attorney versus a whole team of salaried government attorneys.