Thanks for the post, but I don't think a real computer security expert would claim any OS is "safe". The only safe computer is one with no power cord, no hard drive, and buried in an underground faraday cage. Linux has benefits over closed-source, proprietary OS's like Windows because its source code can be reviewed and inspected by anyone to improve it and find bugs. That makes it somewhat more challenging for someone to deliberately put in back doors like Windows. Also, even if a TCP channel is compromised it's relatively easy in Linux to build a fence around it by running the process as a non-privileged user.