Open source is insecure, and other FUD

@gbinal, @konklone any other common arguments to debunk?

Fixes #66.
+ :100: but I'd definitely hit the hammer after the first line: only authorized people can approve changes to open source projects, just like closed ones. e.g.

> The idea that anyone can make changes is simply untrue -- FUD at its best. Like with closed projects, only authorized people can approve changes to open source projects.