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Yeah, I think their perspective of therapy seems to be to make you feel better. But it's not always that. If you're overcoming narcissism you're going to have a different experience than if you're a battered spouse. The therapists job is going to be to make the first person face hard truths and hold themselves accountable, and it's going to be to help the other person leave their situation and realize their value. If those two people are a couple, knowing the other partners perspective isn't bias, it's revelatory.
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I don't mean to be rude but I feel you're operating on a bit of TV based version of therapy.
You're right that there is such a thing as a conflict of interest in psychology that prevents psychologists from working with certain clients. However, it isn't like in TV where this is to somehow shroud them from the context of your life. 
Generally speaking, friends don't fall into that description for several reasons. They simply do not have the kind of impact on your formative experiences, traumas, etc, for them to be the focus of therapy or for their relationships to be that relevant. A psychologist is unlikely to even know that various patients who aren't couples or families know each other at all. 
With couples and even family, the reality is that the job of a psychologist is not to comfort you or validate your perceptions. In fact, psychologists may ask you to have friends or family fill out questions on you, such as in assessing ADHD or various other issues that your self perceptions may not be completely accurate on, it is an assessment tool. 
In psychology, external context on your behavior is not a bad thing. Sometimes, what you need is literally to know that you are in fact in the wrong, or if you're not that in fact it's time to call it quits with the relationship. So you're right that it is impossible to remain unbiased as a psychologist, you are wrong in that has not been the objective. Psychologists don't form personal relationships with clients because liking the person in fact can shield them from negative perceptions, and because the person can begin to put their relationship into the perspective of the therapist. >

This is basically what I came here to say. I'm having trouble understanding OP's point. They seem to be under the impression that the therapist's job is to mitigate disputes, when it's really to help each person process their own understanding of the situation. If, for some reason, other members of the friend group come up in therapy repeatedly (and that seems like a bad sign), the therapist isn't there to make sure they're still all friends at the end of the day. The therapist is there for the patient, not the drama, and it's extraordinarily easy not to get wrapped up in the drama of a friend group you're not friends with.