"The system" slows the process because there is systemic corruption. Just as cops don't want to be photographed, prosecutors don't want their convictions overturned. So they don't play fair, and do everything they can to avoid true justice.
In general, I couldn't say. (Also, a citation showing that the people who are ostensibly meant to uphold the law are in fact not playing fair and doing everything they can avoid justice..? What? How would that work)
But a nice example would be this very case - even after the case was basically retro-actively thrown out, the prosecutor's office still maintain everything was kosher. (They still maintain that Collins is guilty - seriously, what the fuck?)
Don't mistake a singular possibility for the general. I gave one possibility; one that's real for me; whether it's the "primary" reason or not remains open to speculation. Many possibilities are possible simultaneously; this all depends on location and individual circumstance, along with the passage of time.
Be part of the problem, or propose part of the solution: that's on you, me, and everyone else who considers the matter. But consider whether you consider, whether you contribute; or whether you merely detract.
