Oh, you mean another innocent person? (Emphais mine)
One reason we're not doing that, I suspect, is that it's hard to figure out what such a reform would look like. What specific additional step could the police have taken to determine that she didn't operate this account, without access to her private knowledge that she's never been to Arkansas and doesn't have the type of phone that was used to create it?
Is there any reasonable way to say "we don't know, he might be guilty, we just didn't reach 'beyond reasonable doubt '"?
He was probably guilty of the two counts of aggravated assault, but the prosecution never showed that it wasn't self defense, which is what Arizona required.
The effect was the same as "not guilty", but there was an idea that allowing the jury to express doubt allowed them to avoid erring on the side of guilt. But it also confused people so they finally got rid of it.
Think of it as "should you bring an umbrella to go outside today?" – the weather forecast has a probability, but your job is to turn that probability into a decision based on your risk tolerance. You can't bring a 30% umbrella for a 30% chance of rain.