You're the minority. I don't know a single person outside of tech, or maybe the "office" world that would consider their PC more important than their phone.
"Stick it behind a firewall and don't go questionable places online."
This is a joke right? My Mom's XP is used for browsing mainstream news sites, weather etc. and her PC was thoroughly polluted despite having an active AV/firewall etc. Infections aren't only a problem for those that use BT.