I don't open attachments from dubious sources. So you are correct that it hasn't crossed my mind. But then exercising some caution is probably more effective than running an AV in this instant, there are also built in ways to give warnings in most webmail services.
Wine is an interesting point. Are there actual cases where people get infected that way though? Not sure if any Windows viruses get gold rating in Wine (they should definitely keep a list. ) Without an AV I think you can still vastly lower the risk by making sure that Wine apps should never go online and config it to map only to /home subdirctories, and of course the same caution about not downloading .exe from random sites applies (I think most wine users only need it for a few specific apps and it is not like they download win software regularly from the web, so the use case is not the same as using Windows) And of course never run wine with sudo.
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