Not another thread on this!
This issue has been tortured in discussion for years. Therapists in the frum community have been thirsting for guidance from rabbonim and poskim for many years. And to everyone’s great fortune, the rabbonim and Gedolei Yisroel have been generous in lending their time to providing this guidance. There are several problems with the OP’s accusations.
First, let it be known that all rabbonim recognize that the professional is obligated by law to make reports of danger to authorities. In that regard, there are some who direct referrals to “therapists” who have no such secular training, and are not required to maintain professional or ethical standards. However, this practice is frought with risk. These same unprofessional therapists have often had other compromises on their ethical standards, with some taking liberties with their clients that are totally criminal and worse than unethical. You might get interesting medical advice from friends and strangers, but I would rather go to someone with medical training.
Reporting to authorities is not mesira, and no one gets arrested for raising questions to authorities. If there is evidence of a crime and there is credible suspicion that someone is the perpetrator that is responsible for it, there might be an arrest. Calling that mesira is plain old ignorance.
Consulting with Daas Torah. Hmm… Anyone I know that consulted with Daas Torah was simply shown the green light. Some rabbonim even questioned why they were being asked. Most situations are that obvious that asking shailos is just a delay in the process. And when the question is more intricate, please tell us who you would consider the appropriate Daas Torah that has the competence to know the subject matter. Just having the expertise in halacha does not guarantee clarity of the subject.
This OP question, often asked, is hardly intended to obtain an answer. Rather, it is a veiled attempt to throw a baseless accusation at the mental health field. We have read the stories. I have yet to hear one that should not have reported. The frum therapists are far more Torah oriented than is implied by the OP.