I am genuinely having trouble understanding how there could be an argument against removing it. Anybody?

From a symbolic perspective, I am all for this. From a practical perspective, OnlineSearcher is pretty much on point - unless we're talking about a statute of limitations that has expired on a case with an untested rape kit, it's extremely unlikely there would be a successful prosecution from an evidentiary standpoint, and this is problematic from an allocation-of-resources perspective.

Every alleged victim deserves to have their case heard, but prosecutors are required to assess the likelihood of conviction when deciding whether to bring cases, and time and resources are limited in our current system. Better that these legislatures should be voting to provide more resources to rape kit testing, intake training, and prosecution of new cases - the more zealously the system gets at prosecuting rape cases, the higher the deterrent factor will be.