Please use the sharing tools found via the share button at the top or side of articles. Copying articles to share with others is a breach of FT.com T&Cs and Copyright Policy. Email licensing@ft.com to buy additional rights. Subscribers may share up to 10 or 20 articles per month using the gift article service. More information can be found at https://www.ft.com/tour. https://www.ft.com/content/fd6f8a29-03cf-4a5f-9ffe-afdfdf359b52?segmentId=b385c2ad-87ed-d8ff-aaec-0f8435cd42d9There are plenty of things Americans disagree on but one shared concern is loneliness. According to a 2024 American...