Modern feelings of hopelessness and nihilism extremely common in the western world, many people are dealing with these feelings through medication. The effectiveness of regular prayer on mental health is surprising according to studies and demographic data.
Let me rephrase that: When the people around you offer nothing but prayers, it's often because they don't believe there is any practical support they are capable of offering. In a group setting, if everyone offers you prayers and zero practical support, the signal it sends is pretty depressing.
To be clear, this was a support group for a deadly genetic disorder that frequently kills children before they reach adulthood. It is classified as a dread disease for a reason. The psychological effect of the diagnosis is huge.
It's practically a sign on the wall a la "All those who enter herein are damned." kind of thing.
The longer I was there, the more the discussion became "Our child is facing X surgery. Have you or your child had this surgery? Pros? Cons? Any good tips?"
Prayer very often means "It's hopeless. Humans can't fix this. Our only hope is divine intervention." And it's hugely depressing and disempowering.