Studies show that people (both PWS and those who speak 'normally') experience stress (raised BP, heart rate etc.) when they hear someone stammering. Studies also show that PWS experience considerable stress when they feel they have to be 'fluent'. This is a dilemma. Who
should have the onus of coping with their stress?

Ideally, the audience should work on their attitudes by developing more acceptance to the diversity we may have in our speech. The PWS also need to work on their overall communication and not worry so much about 'fluency'. Both need to be aware of their sub/unconscious reactions (like looking away, shifting uncomfortably, etc), in order to be able to deal with them successfully.