I don't have an answer, and I'm not sure if this comment will be welcome here but I just wanted to point out that you can't ever know the struggles of others. The people you meet may be struggling with depression, or bulimia, or cancer, or infertility and you will never know it. Human problems are often invisible to others, and stuttering is an exception to this rule. There is a famous quote: "Be kind, for everyone you meet is fighting a hard battle." I believe it's very true.