I think the quote that comes to mind is "how many cockroaches do you need to find in your bowl of spaghetti?"
I'm simply pointing out, that a talking bullet of open source, is no longer valid. Unfortunately it is a bullet needed to counter so many other negative bullets.
And let's be clear, you have never met/heard of a prominent security researcher who favoured open source over closed source. You may have met someone who thought they were all that, but in fact were not. Open vs close source has to do with public access to source code. Anyone 'prominent' who was anyone, would be offered a look at the closed source, if it was indeed for security evaluation. As much as I agree obfuscation does not lead to good security, it certainly does not detract from it. Had this code of openSSL not been publicly available, it could have been fixed before most of the internet was subject to people trying to take advantage of its errors. Sorry, hard reality.