Birds may don't like humans.

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Everybody may not familiar with this but when any human touches any bird, the other birds of their species kills it. In my school time, we found one baby sparrow. The feathers were already started to grow on it, so it was not too young. It may fall down from it's nest when trying to fly. We noticed the sparrow and decided to save it. One of my friend took it home. We gave it small grains and cooked rice to eat. But the next day when we left it, other sparrows attacked it. We were felt very bad because we were trying to save it but unintentionally failed in it very badly. Not all birds have this behaviour but many have. Nightingales are also same in such cases. May not all species because few people keep it as pet in bird cage. But I am thinking, why do they have such behaviour? Do they don't like humans?