Fall of persons and objects

A news item  mentions about suicidal death of a young lady software engineer by jumping from the 4th floor of a multilevel car parking building. What is stunning is the injury to a contract labourer as the lady fell on him during the jump.
This reminds me of an incident heard from my colleague in which a snake held by a bird flying in the sky slipped and fell on a person on the road and the person died due to snake bite.
The reasons for accidents are generally attributed to as 88% from unsafe acts, 10% from unsafe conditions and 2% from others. This type of accidents i.e injury to contractor worker or death of person on the road due to snake bite come under this 2% category.
Though we say all accidents can be prevented, it is difficult to imagine what can be done in these situations to avoid accidents. In the first case, may be, if the sidewalls of the terrace or road inside the parking building are raised to a height of - say 5 ft or more, could have prevented the person from scaling the height and protected the persons down below. But, in the second case, I do not know what can be done.
Such situations, even if brought out by any safety person, would have been laughed off as 'nonsense' and the person will be snubbed for thinking too wild. May be the risk level is very low, but not ZERO. As long as any opportunity is available to save the persons, the investment is worth as nobody can get back the life. The person's life may be valued at some amount and is compensated but he is more valuable to his family members than the compensation and this should be kept in mind. Else, surely there can be chaos and society has to bear it.