My bias though is probably skewed through the media I consume. I do watch a lot of channels like Lackluster YouTube videos (shows corruption and double standards in policing)

Yeah. I don't want to get into my whole take on ACAB or anything, but what I'll say quick about it is that when the court system is involved, the opportunity for abuse is way less. Police on their own with no oversight and everyone believes what they say always like back in the day, is way different from police with bodycams and modern hypervigilant cell-phone/news-media oversight like the modern day, is way different from police having to show up in court and the defense lawyer gets to mount a vigorous at-length factual challenge to whatever they're saying happened. It's still far far from a perfect system (public defender / plea agreement / wtf) but it's also not equal to the stereotype where all the cops are just trying to get out and do as much harm to society as they can possibly manage every single day and nothing like working to catch rapists ever happens in real life.

Plus, if the cops wanted to falsify the DNA and put someone away, they can do that without 23andme being involved. If they're trying to run a match against the DNA they found to look for people to interview / cross match with whatever sample they have, then that's already a moderate indication that they're trying to find the actually guilty person.