Agent Smith (later merely "Smith") is a fictional character featured in the Matrix film series, played by actor Hugo Weaving. The struggle between Neo and Smith ends up becoming the main plot underlying the events of The Matrix, making him the primary antagonist. (...) Agent Smith complains at one point that the Matrix and its inhabitants smell disgusting, "if there is such a thing [as smell]". Smith has a strong hatred of humans and their weakness of the flesh. He compares humanity to a virus, a disease organism that would replicate uncontrollably and eventually destroy their environment were it not for the machine intelligences keeping them in check. (...)
"I’d like to share a revelation that I’ve had, during my time here. It came to me when I tried to classify your species and I realized that you aren’t actually mammals. Every mammal on this planet instinctively develops a natural equilibrium with its surrounding environment, but you humans do not. You move to an area and you multiply, and multiply until every natural resource is consumed. The only way you can survive is to spread to another area. There is another organism on this planet that follows the same pattern. Do you know what it is? A virus. Human beings are a disease, a cancer of this planet. You are a plague, and we... are the cure."