If the speaker can convince the listener they should find a job where they don't need to speak as part of the job description. Dishwashers and janitors give pletnly of job stability for people like those.
I was too abstract. I meant that when a message is misunderstood by a large enough chunk of the audience it's the speaker's fault for not knowing their audience and their needs.
To be clear, you demonstrated the bias I was referring to by casting doubt on the intelligence or job-worthiness of the listeners rather than recognizing what I said about effectiveness being improved if you can get your message to more people.