There is a lot of destruction caused by the flood but that doesn't mean there are not any benefits of it. Nature is so well balanced from the beginning that if you want to control a certain part of it there will be a problem. Flood brings fertile soil all over the land and washes out all the chemicals that we used to grow crops. Flood is important because of agriculture.
Floods only look good if they don't damage anything or eliminate anything in local residents' settlements. But if a flood can damage agricultural land and damage people's houses and roads where residents access it every day, where is the good value in that?
Because there are many people who fail to harvest when their land is flooded and it is mostly caused by deforestation that is not controlled by the local government so that flood disasters can easily come to villages or cities not far from the mountains. Although this also happened because the drainage ditches were still narrow and not too deep so that overflowing water could easily come to residents' settlements.