But people seek out therapy, they generally don’t want it from their friends and family without prompting.

Let me be clearer and more concise then.

Yes, people shouldn’t give unsolicited advice by default, but if one wants a precise style of listening without reaction, the onus is on one to say that up front, or pay a therapist, and, finally, venting will elicit comments and/or criticism regardless of the taboo of advice, depending on the nature of one’s culpability.