Human beings are the most vicious and dangerous species on this earth. Other catastrophes that cause upheaval and violence include fires, floods, hurricanes, tornadoes, dust storms, lighting strikes, earthquakes, tsunamis, volcanoes, epidemics, land and mud slides - these are acts of nature and not done by the hand of a god or omnipotent superpower.
Non-human species (one to five-sensed being) basically cause himsa for when seeking food for their own needs, but do very little violence for other purposes.
In contrast, and by choice, human beings are the most vicious and destructive species on this planet. Himsa by human beings is mostly intentional and most devastating in scope. These actions encompass war, personal and domestic violence, terrorism, border and land disputes, human trafficking and slavery, environmental and ecological destruction, for sport, entertainment, business, food, medicine, and clothing, actions to serve power, ego, greed, anger, religious supremacy, to assert control and just for fun.
Himsa by human beings is most heinous in nature; newer forms of himsa are invented every day and it keeps on increasing in scope and size, but most of it is controllable and avoidable.