But in the world of open source, assuming such common ground can be frequently a mistake.
Security means different things to different people.
For most people in the open source movement, a secure operating system seems to be one that is resistant to external attack. It's a computer that you can put on the Internet and be reasonably sure that nobody will be able to break into the system and change its homepage, and that nobody will be able to shut it down. This broad definition of computer security includes other issues, such as reliability and manageability. Or taken another way, a computer that you consider to be quite secure may be not secure at all in my book. The question is one of policy.