Therapists ought to stick and around and deal with whatever they have provoked in the client, whether it is anger, compulsive venting, obsessive thinking, neediness, blaming. Yes there are limits but therapists should have fairly high tolerance for discomfort and should be uber-patient, not bolt or become irrational at the first sign of client difficulty. Otherwise what on earth is the point. It's quite the betrayal to stir these things up and then announce that you'd prefer not to be bothered with it.

Also therapists who feel the need to control the process, or boss the client, or decide what is "in their best interest ".... watch out. It's the beginning of bad things, e.g. i'm abandoning you because i care. For me this is where the most damage was done.