They shoot there because is no human left in them. And it is not only Putin himself who is to blame, but also the people who carry out his orders.
For example, a captured russian pilot told reporters around the world that he had seen and understood during the mission that he would launch a rocket into a high-rise apartment building in Kharkiv. But he did not refuse to perform the task and was fired. I will try to find that video with subtitles or I will make them myself and I will definitely write about all this here.
When they are taken prisoner, they say they knew nothing about what they would do. And then, when you find their social networks, you see that they published before videos bragging about bombing cities, looting shops and destroying the Ukrainian people.