A Zombie plague is more likely to be the result of a fungus than any other Pathogen

I must admit, my opponent creates a compelling argument. However, I cannot agree that a man made, or artificial, pathogen. While yes, I am inclined to agree that man's progress in bioscience and biological development in both the medical and war sectors is impressive, and there have been numerous accounts of pathogens that have been developed by scientists. Yet, I do not believe that nor agree that man could create an artificial pathogen capable of sending the infected hosts into a zombie like state. For one, my opponent does support that humanity has a bigger impact on nature than nature does, yet, that is where OCU reacts. Humanity has threatened and still is threatening numerous ecosystems on a global scale, as a result, species die or are forced to adapt in what way they can. Due to OCU being a fungi and having a very quick reproduction rate, in time, humanities impact on nature and its ecosystem will do one of two things to it. Forced evolution as a means of survival, or die out. The only reason I feel that a forced evolution would be the result is because the human effects on the environment OCU inhabits would be on the more widespread ants. The ants OCU uses as hosts would see a shortage in colonies or a migration to other locations with the suitable conditions for the nest. As a result, other insects, arachnids, and other wildlife would be more abundant due to such a predator moving. OCU would then begin releasing spore in the presence of other arthropods, which, when successfully introduced into a new host, would have an affect the fungi. In this process, the chain would begin moving to mammals, which includes humans. That is why I believe a forced evolution would occur. Now, to counter my opponent's argument. My opponent believes an artificial pathogen would better result in the Zombie apocalypse, or at least make a threat of it, more so than OCU. However, my opponent never states what kind of artificial pathogen would be the result. This leads to that exact statement being questioned, what kind of artificial pathogen would be created by man? And why would it have a Zombie like effect on infected humans? The second question is relevant only because, all the pathogens developed by man have been created as a means of killing or bringing great pain. Anthrax for example, is a natural bacteria that has been modified by man and weaponized. Yet, this bacteria kills the animals and people who have it, quickly or slowly, it matters not. Dengue fever, a virus, was found naturally and modified by man, death does not come from this and recovery occurs in about a week. The list goes on, but all pathogens created by man are either to kill, maim, or incapacitate. While yes, it is impressive how far many scientists have come in the genetics and biologic fields, yet, there is no way that man could create a pathogen, be it a parasite, virus, bacteria, etc, that is capable of bringing man down to a state of pure aggression and lack of higher order thought. Governments wouldn't allow it, the people wouldn't allow it, and due to knowledge of such a thing being possessed by numerous officials... all variables would be controlled and mistakes or errors would result in termination. OCU, being in nature and evolving without surveillance, would have more time and freedom to become the cause of the apocalypse. I have attacked my opponent's arguments and would like to commend him on the challenge thus far. I look forward to his supporting arguments and counter arguments.