Put another way, if you were a property owner, wouldn't you perform due diligence before engaging in a business relationship with a renter?

You'd check the person's credit history and call a previous landlord.

I don't care about my therapist's credit score. But I am going to perform due diligence before allowing her to take up residency in my psyche.

Searching online for basic social circle and other information is faster and cheaper than going to weekly sessions for a year and hoping it all works out and nothing strange pops up.

It is wrong to shame people for protecting themselves by doing something legal and available.