Can a therapist who is insecurely attached, help w/attachment issues?

I don't hate my 'neediness' which I know simply as 'needs'.

The good thing where I am is that therapists are required to undertake career-long monthly supervision. This means that anything which has the potential to get in the way of the therapeutic relationship can be examined and managed.
No human being has no 'issues' which might have the potential to get in the way of the therapeutic relationship. I can think of examples in my own therapy where my therapist has had to keep his own stuff in check, but he's still undoubtedly an excellent therapist.
Self-awareness and non-defensiveness in the therapist are key.

I always like interviewing them. I find those people fascinating in the bizarre ways they present themselves and how they act at clients.

No

No no no

No no no

This is what got me so epically hurt in therapy

Me too. I'm sorry you had to go through that.

I don't think there is any legit way to evaluate a therapist up front.

I've sat in front of 20+ of them, and each was a closed book and gave very little away. I've tried asking non-threatening questions, and some couldn't handle it. So, asking about their attachment status or mental health, that's probably not gonna go well with most. Plus, having worked on their own issues in therapy means nothing. It could easily have made them more neurotic. Add to that years of engaging in weird "clinical" relationships and they might have real difficulty relating in a healthy way.

If any therapist has not done their own work, no matter what kind of therapy they specialize, cannot be a good therapist in my opinion.

I think therapists with insecure attachment styles *can* help clients with attachment issues, but they must be aware of their own attachment style and understand how their attachment style influences the therapeutic relationship. There's a really great book called Attachment in Psychotherapy that touches upon these issues. (I would link to it, but I don't have permission to link to things yet.)

50% (or more) of therapists are simply incompetent. It has nothing to do with their attachment styles.

If a therapist has some deeply rooted relationship sickness, they cannot just put that aside and do the right thing, when what they are selling is a relationship. Also establishing a thearpist's fitness for helping others is very difficult, as it's dependent on vague and abstract concepts like attachment status or mental health status, and is hampered by their evasiveness.

An oncologist with cancer could be a huge liability, or could simply be too sick to work. But at least these things can be defined and evaluated with some precision.