Our sins and the sins of others are the main reasons of tragedies
The majority of tragedies and disasters on earth that daily destroy great many people are a result of lawlessness of the people living on earth.
«So you shall not pollute the land where you are; for blood defiles the land, and no atonement can be made for the land, for the blood that is shed on it, except by the blood of him who shed it. Therefore do not defile the land which you inhabit, in the midst of which I dwell; for I the LORD dwell among the children of Israel» (Numbers, 35:33-34).