Not every person studying crime appears to be wanting to lessen it, and maybe comprehend it for their own purposes. Boy, that's awful. This seems to me why investigative measures, though I would prefer they were completely transparent, likely cannot be. JMOO
I think some of us are referring to Criminology, as a discipline. It
does have the goal of preventing crime. While (obviously) some people with the opposite view can be admitted to the discipline, any such person is at odds with the stated goals, outcomes and ethics of Criminology.
Most Criminology students, further, already have degrees in Criminal Justice - the study of bringing criminals to justice.
en.wikipedia.org
All juried publications in Criminology are peer reviewed with a rubric that has to do with preventing crime. All learning outcomes in classes are geared to understanding and preventing crime.
If someone tries to be in this profession while having the opposite goal, it strikes me as like being an anthropologist who hates other cultures (it's against our ethics to judge cultures and we also have plenty of other rules - unique to our discipilne). It would be like a doctor who wants their patients to remain sick. Sure, it happens (cf. Dr. Death) but when it does, it is strikingly out of balance with the intentions of the community.
However, those of us who do study crime know that there are higher incidents of certain crimes amongst various parts of the crime-prevention community. Police, for example, are more likely to commit certain crimes than the non-police community. And now we have a really public example of a criminologist apparently using professional knowledge to try and commit "the perfect crime." The notion of a "criminal mastermind" who is also a professor is enshrined in Sir Arthur Conan Doyle's Moriarity. My own work has involved finding law-breaking LEO's (hired by LE to conduct participant-observation research inside local police stations).
Without further ado, here is the Code of Ethics for American Criminologists (and the one for Criminal Justice is perhaps even more strict):
And here's the statement for Criminal Justice:
Both emphasize transparency and never using one's field of study to manipulate or coerce or even confuse other people.