Not all malware relies on patchable vulnerabilities. Even being alerted to a known exploit arriving from some vector allows a user to take action, even if they're not vulnerable. I'd certainly stop browsing a site if I discovered they were trying to infect my computer with something, even if they can't infect it. Though I generally wouldn't run an anti-virus scanner because of the performance implications - they tend to suck up tons of CPU resources and are awful for developers or anyone who creates lots of files. But that doesn't mean there is no use-case for anti-malware scanning.
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