Is Open Source code less secure?

Some US regulators have apparently come to the conclusion that, by nature, open source software is less secure than closed source. By effectively siding with what is known in cryptography circles as "security through obscurity," the controversial idea that keeping security methods secret makes them more impenetrable, the FCC has drawn an outcry from the software radio set and raised eyebrows among some security experts.

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Zeropoint.IT finds it ridiculous to think obscurity improves security. How can you prove something is secure if you can't see the source code? You can't. Some of the most secure encryption algorithms are publicly available and discussed in several school books. The most secure operating system is completely released under an Open Source license (BSD). This was never a reason for these two examples to be frowned upon form a security point of view. We would never trust a vendor who wants to keep elements as crucial as encryption and security obscured. This is only a reason more to believe that vendor has something to hide from you, and how could you ever tell that security is the actual reason they don't want to show their methods to the public?