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> The sole purpose of eradicating the idea that Windows is insecure and prone to viruses

Well, during Windows XP days if you connect to a LAN with compromised devices (in some countries it was popular to just hook up the entire neighborhood to a series of switches or poorly managed office network) before you install every single update possible - too late, your machine is part of the botnet.

Also, some environments require antivirus running for certification even if the machine in question is a linux server with read-only volumes.