Top quality training for potential therapists with an emphasis on self-awareness and reflective skills. From what I can see, most therapists cause damage when they haven't worked through their own stuff to an acceptable degree and so it gets re-enacted in the room. Therapists who deny/can't deal with client transference also fall into this category. Therapists should be trained in being aware how they are being impacted by the client. They should also be aware of any potential judgements, prejudices and other feelings towards certain people or behaviours or issues and be willing to address this as part of their ongoing personal and professional development. Humility is key, not ego!

Also, regular personal therapy should be a requirement throughout training...it is in the UK. You can't train if you aren't willing to go to therapy at the same time.

Regular, ongoing supervision...again, this is a requirement for therapists in the UK who are registered under a professional body such as BACP. Supervision should never stop simply because the therapist has worked for a few years. Every client is different and brings up different issues.

Reputable professional bodies such as BACP in UK which produces ethical guidelines and a complaints legislation. I'm not saying it's perfect, but it's certainly some protection for clients.