I believe in being prepared for emergencies. Things like having flashlights and spare food and a means of protection and so on. However, spending all of your time and energy on preparing for some "what if" scenario that is unlikely to happen, IMO, isn't living at all.
To relate this differently, I like to go swimming. But I won't get any enjoyment out of it if I wear a life vest or respirator every time I went to prevent me from drowning. Or wear chain mail every time I step foot in the ocean to prevent shark attack. It's just too much.
When it comes to temporal management:
1) Learn from the past.
2) Prepare for the future.
3) Live in the now.
Life has it's risks and dangers. I choose to not to live in fear of them as much as possible.
That's my thoughts.