I was indoctrinated to believe that such things were chastisements from God...at this time I'm not so sure about that.
The one good thing about natural disasters is they motivate people to Unity, charity, and good works. They also produce lots of Heroes.
Some religious folks argue that this life is a test, and the trials are too perfect us, help us grow in patience and virtue and Charity.
Disasters can also waken a person up and open their eyes to what's really important in this life and detach them from material possessions.
Matthew 5:43-48
43 “You have heard that it was said, Love your neighbor and hate your enemy. 44 But I tell you, love your enemies and pray for those who persecute you, 45 so that you may be sons of your Father in heaven. For He causes His sun to rise on the evil and the good, and sends rain on the righteous and the unrighteous. 46 For if you love those who love you, what reward will you have? Don’t even the tax collectors do the same? 47 And if you greet only your brothers, what are you doing out of the ordinary? Don’t even the Gentiles do the same? 48 Be perfect, therefore, as your heavenly Father is perfect.