A stray bullet from a drive-by shooting could hit me in the head. None of these things is likely. They are all possible. The point I wish to make is that I wouldn't waste a single minute worrying about any of those things. I would have wasted an hour of precious, wonderful life.
Life is far too short to spend any time on the what ifs of life.
So much energy and precious time is wasted on things that are very unlikely to happen. I wouldn't suggest that we go through life with rose-colored glasses, living in a fantasy. But neither would I suggest that we focus on the negatives in life that are beyond our control. Living this life is certainly like walking on thin ice. Dance while you are here.