the main problem is peoples I don't know, civic pride. Inteligent people are unwilling to do jury duty, either because they work and the paltry offerings they give out for time you miss is so bad that its not worth it, or people are genuinely scared of retribution.
So half the people that end up on juries are criminals themselves, people without anything better to do who actually want to do jury duty and these are the results you get.
What people need to do is have better links to business, jury duty needs to be looked upon as a great thing to do so more people do it. They need to encourage business's to let their employee's go and do it without punishing them for time off, etc, etc, not let them lose money.
Once the jury's are actually made up of lets be honest, a better class of people, then people will get what they deserve on trials.
Its utterly ridiculous to base a system around juries when you can't keep criminals out of the juries.
I don't think you'll see a massive number of white collar crimes go unpunished because a bunch of wall street types end up no a jury, but even if they did I'd prefer those types of crimes to end up with more sympathy, than murdering raping scum to get lenient treatment.
At the end of the day no one "in power" like pm's, judges and etc can be blame for peoples lack of responsibility and a jury determining these people aren't guilty. They are responsible for encouring the right people to get into jury duty, but thats not an easy task.
Whats the answer, ditch jury's, tbh you'll put away more guilty people like these than the few innocent people that get locked up due to lack of a jury, is that better for the majority, yes. Would you personally prefer to end up framed for a murder and locked up with a juryless trial, no, and thats the way people vote on problems like these.
There really is no simply answer, unless of course theres some "veto" power that can allow say the PM or other designated people to step in for these situations and change the verdict or at the very least demand a new trial with a different jury.