On another thread someone suggested that those who had been advised to shield but didn't want to should be asked to sign an advance directive instead. Some people really do think like that.
If the government expand the shielding group to include e.g. everyone over a certain age or BMI, rather than people with very specific health conditions, I can absolutely see some people being given a very hard time for 'shopping while old', 'going to the park while fat' etc. just as people are given a hard time for being unable to wear a mask.
Throughout this pandemic there have been comments, in response to someone explaining the difficulties they or a relative are having with the rules and restrictions because of a health issue or disability, that if they're that vulnerable they should be shielding anyway.
So it's very, very important that we do keep stressing that shielding is not compulsory and the people on the list have the same rights as everyone else.
At the same time yes, for many people it's not much of a choice at all because the risk is so great for them, and they live somewhere with high community transmission. And those in care homes don't even have the illusion of choice, whether they're on the shielding list or not. There's a human rights case being brought about this:
www.carehome.co.uk/news/article.cfm/id/1632907/Families-demand-PM-fix-guidance-on-care-home-visits