It's not bias, it's fact. I've been an IT pro for >15 years and I haven't seen an Internet-connected PC yet that has gone 5 years without getting infected by something. Microsoft's security has improved drastically from Windows 95, but the sheer volume of the market and the speed at which those with nefarious designs can find vulnerabilities (and the slowness with which most companies react) means that there are always going to be threats you are not prepared for. Instead of being a reactionary fan-boy, accept this reality and plan accordingly.

And by-the-way, neither Linux nor Apple are invulnerable either. In the case of Linux, they just have typically have a higher percentage of security-conscious/trained users and administrators.