I don't know why people - like many of the previous commenter's here - find it so hard to be more empathetic about other people's different circumstances.
For example, I live alone and have no family anywhere nearby. Even though I'm not clinically in any of the at risk groups, I do feel more vulnerable because I'm on my own. When I read the stories from people who have had the virus and how they were really ill and their partners helped them, of course it makes me worry about what would happen if I got ill. I have friends nearby but obviously wouldn't and couldn't expect for any of them to risk getting the virus themselves. Obviously there is always the risk of other illness too but this feels different because you specifically need to stay in isolation. I had cancer or broke my leg, at least people would be able to come and help without the fear of catching anything.
But the flipside is also that I'm cut off from much of human contact at the moment and really for the foreseeable future. At least I'm an introvert anyway and quite like my own company so it's manageable. My next door neighbour though also lives alone and she is in the shielding group, and she's also a total extrovert who usually has lots of people visiting her. I can imagine it's been extremely difficult for her to not have that human contact for such a long time, and she still has to avoid so many things she usually loves doing.
I'm not sure what support there could be to be honest, and I don't really expect it, but I do wish people could just be a bit more understanding. Whatever happened to "be kind"...