The security of the applications people run on your operating system is not an indication of the overall security of the platform.
However, many techniques are in place on several OS's to help mitigate some well known attack vectors.. like buffer overflow protection and memory space protection.
The point is that the base OS is secure, what you choose to run atop of that is your responsibility to maintain.. even if at the end of the day that means you need to go beyond the realm of supported and apply a few patches and build things yourself.
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