Working in the legal system for many years, it was always very clear that these are courts of law, never courts of justice.

The legal system requires minor technical hurdles to be passed to "prove" guilt. Experienced prosecutors know that the facts of a case are irrelevant (as demonstrated here, very starkly). Get enough of your check-boxes filled in and you "win" and you're up for promotion based on all your wins (or election to higher office etc.). That's all a prosecutor is interested in (i.e. their own promotion, building a track record of winning).

Justice, I'm afraid, does not get a look in. Sometimes, by coincidence, it may meet, but that's never by design on the prosecution side.