I completely agree, it shouldn't be acceptable that there are so many ignorant, incompetent, and/or poorly trained therapists out there who don't understand their own limitations and who are capable of doing so much unwitting harm.

There are structural changes that are needed in therapist training and regulation in order to do a better job protecting clients. Not every therapist needs to be a specialist in every issue, but part of being a minimally competent generalist is recognizing what's outside of your scope and knowing when your skills are inadequate to the task at hand!

Anyone with two hands can catch a baby when a birth goes easily and smoothly, but we don't let everyone with two hands call themself an OB or a nurse midwife--we make sure that OBs and midwives have the skills that are needed to assess risk, recognize when intervention is needed, and either make the needed intervention or refer to someone who can. Right now in some cases I think therapist licensing is closer to the "anyone with two hands" end of the spectrum, and it needs to be treated more like the complex, risky profession that it is.