I don't actually like everything explained immediately, in fact I often find it interesting if some things aren't explained at all. The problem here, for me, was not that but that I kept seeing things that didn't seem to make sense. Some of them would have made sense if I had read the description, though, so I guess that was my mistake.
We have incurable diseases, sure, but they haven't been declared incurable and then left on their own as hopeless. Those diseases are being studied and possible causes and treatments developed. With some conditions more than others. I don't anymore remember the exact details that made it seem like in this series world the society had given up, except for the MC's group, who places all of their hopes on the Doctor. Placing all of their hopes on a single person is silly, but on the other hand, if the whole world is more or less broken already, there's not much choice.
Before I knew the details, that is, before reading this thread, I was also annoyed by how the situation in the town didn't make any sense. Now that I know, it's not so bad, though I still can't say I'd like those petty James Bond villains who seemingly want everybody to die and the world destroyed just because. It's kind of annoying because at first it looked like a terrorist organisation founded by the sick and ostracised, for a purpose. But when they start killing and destroying indiscriminately, they aren't working for any cause anymore. Of course they could be madmen being used by the true villain for something, but they look far too organised and with too much resources for that.