[mempko]

I can see this being useful for running proprietary and non free software. However, we should strive for all software to be free software instead. Because if I download free software, I have the community of developers to vouch for it. If I download proprietary software, I can't really trust it.

[vidarh]

My answer to that is "heartbleed". It is irrelevant if you trust the developers - sometimes those developers will make mistakes. Sometimes those mistakes will be serious.

The less privileges your applications run with, the less likely it will be that exploits will affect you.

[azernik]

You think you can trust the authors of every free software package to have kept out all security flaws? That's a mighty happy world you live in.

[tonyedgecombe]

As a programmer who makes his living selling software I'm not particularly keen on "all software to be free".