"Secure by design" doesn't mean 100% secure no matter what. Part of that design is the update/patch process that addresses vulnerabilities quickly, and mitigating controls like lower default permissions and application signing.
The fact that you're so quick to call everyone an astroturfer because you made a ridiculous statement just proves that your only interest is trolling.
(1) You claim that because someone wrote malware that requires root access to install, but can't be used to get root access to a system in the first place, that the vendor who makes that system should no longer publicly state (in their marketing materials no less) that they care about security and design their operating systems with security in mind.
(2) When people downvote your incredibly astute, mature, and insightful comment, you feel the need to follow up on it and complain publicly about people giving downvotes. Because everyone knows that the most appropriate response to downvotes is to complain about getting downvoted.
(3) You don't stop there, though! Why would you? You are so confused as to why someone would disagree with you that instead of reconsidering your original opinion, you assume that a huge corporation must be paying people to downvote the deep, deep wisdom you've chosen to express here. You don't keep this suspicion to yourself though- you are so certain of its veracity that you publicly state your conspiracy theory as well, because of course you will.
Any one of these things is incredibly downvote-worthy. All of these things combined are a perfect storm of comically stereotypical Internet forum asshattery that everyone has seen a million times over during the past 20 years and has no desire to ever, ever see again. Sadly, it will never completely go away because there's always a new generation to keep the traditions of Slashdot circa 1997 alive (or Usenet after September 1993). All anyone can do is downvote on sight and hope that each generation learns these lessons a little more quickly than the one that came before it. Honest critical thinking == good, mindless hateful tribalism == bad, that's all there is to it.
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In fact, it says it on this current page:
http://www.apple.com/business/mac/
"Because OS X is secure by design, there’s no need for IT to install additional tools or lock down functionality for employees. And with an automated zero-touch deployment process, they don’t even have to open the box."