Yes, I think that it is important to make this point around as docker gains popularity: security is not part of their original design. The problem they apparent

Yes, I think that it is important to make this point around as docker gains popularity: security is not part of their original design. The problem they apparently wanted to solve initially is the ability for a linux binary to run, whatever its dependencies are, on any system. It does try to keep containers separated but it does not enforce thatthrough a particularly strong mechanism.