Most Hindus respond to natural evil by trying to help those affected by it and through understanding of what life is. Examples of natural evil include:
The Bhagavad Gita encourages readers to 'detach from the world' and appreciate that everything is just part of an eternal cycle. The role of humans is to do as little harm and as much good as possible so that they may escape this cycle. Liberation from rebirth is called moksha. Humans only suffer because they cannot accept how 'limited' their existence is in the scheme of things.
Most Hindus believe that moral evil is caused by other people. They feel that Hindus should act with kindness and non-violence to all living things, called ahimsa. This means treating all living creatures and the planet with consideration and kindness, and never causing harm to any being.
Those who deliberately hurt others or harm the Earth will face karmic consequences, but it is the duty of everyone else to both challenge such people and help them to 'see the light'.
Mahatma Gandhi taught Hindus that it is their duty to help people who are suffering:
…non-cooperation with evil is as much a duty as is cooperation with good.Mahatma Ghandi