I don't see why you don't have enough space in your (I'm sure perfectly intelligent) mind to think about more than one thing. Or understand that even if you don't give a shit its still a real thing that other people need to worry about.
It would be nice if people had the most basic handle on the topic before pontificating, wouldn't it?
Geez Taskmaster you have made your 'point' and really need to back off now 
Dipping I am sorry to hear you are so unwell and completely understand that this must take priority in your life right now, particularly any worries you may have around treatment, family, work, keeping a roof over your head, etc.
And of course it doesn't mean that you don't give a shit about the prospect of nucleur war or hacking or climate change... it just means that you cannot afford to spend precious mental and emotional resources worrying about it. Completely understandable and a sensible response imo.