"Never talk to the cops." Isn't just for people who are guilty. Same with talking to a lawyer. I would hesitate to hand over my personal information, moreso if I don't have faith in the institution it goes to. I hear so many stories about rape kits never getting processed and how difficult it is to convict on rape because it's mostly he-said she-said. I also think putting someone in the position of getting caught so they can maybe catch their rapist isn't a great way to reduce overall crime.
There are a bunch of examples where this plays out poorly and nobody has a fear of getting caught. Black people had higher vaccine hesitancy because of historical distrust[1]. The CIA used a Hepatitis B vaccination program as cover to collect DNA to find Bin Laden[2].
[1] https://www.bloomberg.com/news/articles/2021-04-13/understan...
[2] https://news.yahoo.com/cia-bin-laden-vaccine-ruse-010004824....