As an adult, you get classified into an attachment style, such as secure, insecure, disorganized, etc. It takes a very dedicated, patient t that fully understands attachment issues to even stand a chance at having an insecurely attached client work towards entering secure attachment. The impact insecure attachments have on adults can run deep. Very deep. Many t's are not specialized in adult attachment issues and therefore underestimate the power it can hold over a client. Insecure attachments often go unrecognized by t's or get brushed off as playing an insignificant role in the client's life. This is when therapy can go dangerously wrong. Also, working through adult attachment issues successfully is a long, hard, demanding process not just for the client, but also for the therapist. A t not specialized or prepared to deal with the complexities involved can get overwhelmed and burnt out quickly which can lead to even further damage to the client yet. With that, though rare, I do think a t can help bring a once insecurely attached client into secure attachment.