I agree, but the question emerges "what is treatable?" Many of the thousands of causes of stress in modern life can't be changed by an individual: I can't unelect politicians I disagree with, clean up the air where I live, or make the roads I travel significantly less clogged with traffic. But I can change my reactions to these. Thich Nhat Hanh taught people 'to consider every red traffic light a Bodhisattva, teaching us to "stop and be here now"'. An individual can treat SOME causes: Disconnect from Twitter and nightly TV news, and if that's what you mean, I agree with you even more strongly. But for larger realities, "the social structures that cause so much of the stress", no immediate solutions are available to the individual. Stress reduction is a good way to go.