Actually, Decerberated, technically the actual shooting and violence began from the human side when (individuals at first) began realizing they got infiltrated by aliens. Now there IS another form of violence that began before the actual shooting started. Although a few people do argue against this and it can still be debated but the Wilde are representative of the Nomad violence that began before the actual shooting started. Taking human hosts, I consider as others do, is a violent invasive action. Especially when the host dies which has been made cannon lore. The host dies due to the severing and replacement of three upper vertabrae by the symbiote. There's no coming back after that. The conventional idea of War, however, began from the humans.