In my country, a T who violated confidentiality by reporting a past crime, even if it were a bank robbery that happened yesterday, would lose their licence so fast they wouldn't know what hit them. Here, they are obliged to report if they believe that there is a risk of physical harm to the patient or someone else, in future, so if I tell my T that I beat my children ( I have no kids, this is a made-up example) he would have to report it not because of what I did in the past bug because there's a risk I'd do it again.

And laws vary between U.S. states as well as regards Ts' obligations to report. So it is actually much more sensible to trust your T than anything you read on the Internet.