I am not defending it's use but a secret program is a targeted program, you can't use it in sweeping arrests without parallel construction. Whereas with an openly existing program you can point out that someone has been talking to their friend about how to get abortion medication and arrest them.

The real issue with 100% enforcement of law is it requires a society with differing values to not just agree on which laws exist but what just punishment is. Without leeway for differing social judgement or bifurcation.