

You only asked about rape/SA, so it was the only topic I responded to. According to FBI stats, the 8-10% is actually pretty typical for many other crimes too, but falsely accusing someone of most other crimes aside from something like murder is going to have consequences that are either shorter term or less severe (reputational consequences of being falsely accused of beating someone up are smaller than being falsely accused of rape, for example). Also, rape/SA often has the accusation itself as the primary or occasionally only evidence against the accused, and sometimes that is enough especially in older cases where any physical evidence would be long gone.
This is in no way new. 20 years ago I used to refer to some job postings as H1Bait because they’d have requirements that were physically impossible (like having 5 years experience with a piece of software <2 years old) specifically so they could claim they couldn’t find anyone qualified (because anyone claiming to be qualified was definitely lying) to justify an H1B for which they would be suddenly way less thorough about checking qualifications.