I think you're missing the slippery slope that this goes down. The criminal charges were way too low, given the alleged actions. The state admitted it had absolutely no forensic evidence. The judge was perfectly fine with this and selecting a jury that was OK convicting in this circumstance. This pretty quickly pretty us down a path of "you're guilty of at least one crime since you've been indicted, maybe a more serious one if we have some evidence".
Does that mean that every single conviction from before the days of forensic evidence is necessarily invalid?
If the argument is that forensic evidence decreases uncertainty, well, it certainly doesn’t eliminate uncertainty.
Convicting anyone of anything is a slippery slope. The only way to be truly sure is to never do it, ever.
The case was a shooting. It seemed remarkable they had neither a gun, spent cartridge cases, blood, flesh, wounds, or anything in the way of physical evidence.