As I've already addressed your other comments in my previous posts I'll just answer the second part of your second paragraph. I was more-so refuting Irigni's comment that stuttering is caused by social anxiety - which is a very common belief and is used to shame. I agree that there is most likely a psychological and biological component to stuttering (as others have mentioned brain studies that show chemical differences between stutterers and non-stutterers). As the psyche and brain both work in tandem discovering causality is virtually impossible. Stuttering has immense psychological consequences thus psychological interventions are helpful, however it is not caused by nervousness or social anxiety, just as it's not caused by the brain - that sounds like an impossibility but it is what it is because we just don't know. There are many theories out there, so I guess people can choose to believe whichever one they want - just don't tell stutterers that they stutter because they are anxious, because that we know is not true.