Because: “The dose makes the poison”.
In other words, any chemical—even water and oxygen—can be toxic if too much is ingested or absorbed into the body. The toxicity of a specific substance depends on a variety of factors, including how much of the substance a person is exposed to, how they are exposed, and for how long.
Looking back at history, it would lead to more propaganda and more support for going to war.
A population getting attacked only leads to that population wanting to an us vs them mentality and emotional knee-jerk reactions over rational responses.