Black ops: how HBGary wrote backdoors for the government, by Nate Anderson
"This is ideal because it’s trivial to remotely seed C&C messages into any networked Windows host," noted Hoglund, "even if the host in question has full Windows firewalling enabled."This comment really isn't a "why is Linux security so much better", but just one example of that principle. The entire article deserves reading if for nothing else than to realize just how confident these people are that they can write such cracking software at will.
Friends don't let friends use Windows.