http://en.wikipedia.org/wiki/Correlation_does_not_imply_causation
Especially when you're picking data as selectively as you do.
I'm not going to start a flamewar. Please respect my objective opinion. I will respect your personal belief.
http://people.freebsd.org/~murray/bsd_flier.html
http://www.cvedetails.com/vendor/6/Freebsd.html
http://www.cvedetails.com/vendor/33/Linux.html
Not only freebsd has less vulnerabilities, but they are also less serious (check exploit or data execution)
so there might be more bugs and exploits to discover.i acatualy like that there has been more holes in linux, because it means that they are fixed.