As I said: faking an accusation on an innocent is way harder than succeeding in getting acquitted when guilty. We, as a juridical system, often err on the side of caution. The "beyond reasonable doubt" formula assures us that, ideally, less innocents go to jail, but the price is cases like that one, where we cannot pin someone who is probably the culprit because we lack evidence. It is intended, and inevitable.
The system is of course not perfect at all, but you are citing very different circumstances and cases that are not related. I am a proud believer in the maxim AJAB, all judges are bast****, but even I know when to draw the line from case by case considerations and sector-wide generalization.
Review legend: GAI🏅= READ IT | 5✴️ = Good read | 4✴️ = 'tis fine | 3✴️= on the verge of being shockingly okay | 2✴️ abysmal | 1✴️ = READ IT (your pain sustains me)