Natural selection is a constant process going on around us, in all species. As species evolve and adapt, the fittest ones survive, the weaker ones die off. It’s sad, yes. But it’s a part of the natural cycle of life. For adaptations to become universal – and effective – the weaker ones need to die off.
Sometimes, for progress to be made, the old things need to die off. Things that don’t work need to be cut off, and to an extent, thrown away. It hurts, it’s not always what we want. But that’s the way it is.