They don't need AV. There is no problem that Antivirus solves. A better solution is application whitelisting and applying updates promptly. In many cases, switching to chromeos/ios/win10s is even better.
Ah, so when you said "The only thing [..] that can stop that [..] is an AV. Nothing else can help", what you meant to say was "it's better than nothing"? I see. Well, AV does not make XP secure, and if you're relying on AV as a security boundary you're in serious trouble.
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