I'm definitely an advocate of open source myself, and I never thought I'd be considering the other side's arguments. It's just that I see major data/security breaches increasing in the news, along with stories (like this one) about cyber-offensive capabilities growing more and more powerful. In the InfoSec world, it seems like anything is hackable, and the balance of power firmly lies with offensive tools. I'm just scratching my head about what the appropriate defensive strategies are going to be, given that Chinese and Russian state-sponsored hackers are known to attack civilian targets. I'm not sure how we're supposed to secure our government, financial, and tech companies against these players.

For all of their known (and probable) capabilities, our three-letter agencies don't seem too concerned about encouraging defensive technologies and securing domestic networks.