Please.
Just link a study or something. FWIW I think it's wild I'm being accused of gaslighting over a simple request. Isn't that DARVO?
The assertion for which you asked evidence is not a correlation between prosecutorial policy ("fully prosecuting criminals") and crime rates, but rather the existence of the policies themselves. So, there's no need for a "study": the prosecutors put it down in writing (and those policies then get reported by the media).
For the record, I support some of these prosecutorial reform efforts, but through legislation which eliminates things like "add-on charges", not by prosecutors selectively deciding who will and won't get them.
But, since you asked, here's just a few -- and I'll make the "simple request" to you to do the "hard work" of a web-search if you want more than these: try Chesa Boudin, Larry Krasner, etc.
Manhattan DA Alvin Bragg announces he is directing his staff either not to prosecute, accept "community diversion" in lieu of prosecution, or at least not to seek any jail time, for a slew of offenses, including e.g. armed robbery:
https://www.manhattanda.org/wp-content/uploads/2022/01/Day-O...
Media coverage of same:
https://www.cnn.com/2022/01/06/us/alvin-bragg-manhattan-dist...
https://nypost.com/2022/01/04/manhattan-da-alvin-bragg-to-st...
LA district attorney George Gascón, upon being elected, issued a memo modifying the policy to reduce the charging of violent criminals:
https://da.lacounty.gov/sites/default/files/pdf/SPECIAL-DIRE...
Media coverage of same:
https://www.foxnews.com/politics/crimes-las-prosecute
And while anecdotal, here's evidence of the implementation of that policy, a letter from Union Pacific railroad to the DA's office, complaining that when their agents apprehend criminals robbing trains, they are not fully prosecuted:
https://www.up.com/cs/groups/public/@uprr/@newsinfo/document...
HN thread on same:
It sounds like you and I are actually quite close in belief that systemic reforms are necessary but that undertaking them by prosecutorial fiat is a mistake. You'd probably appreciate this analysis:
https://harvardlawreview.org/print/vol-132/the-paradox-of-pr...
Telling people crime isn't happening or that they're just imagining it's going unprosecuted is a form of gaslighting. I'm again mass incarceration, but I think prosecutorial discretion is a sneaky/bullshit way of going about decarcerating and fixing the justice system, and I think it's going to lead to a dangerous backlash. So is lying to people who can see reality with their own eyes.