Yes, the number of attacks have doubled, but the ratio is still far below the number of attacks against Windows and Windows-compatible products.
Historically speaking, yes, that would be an accurate statement.
You have to also take into consideration how long both products have been in general use in the market place. Windows has been around a lot longer in the consumer world than Linux.
That landscape changes daily.
Linux servers are becoming more prevalent as web and application servers for major corporations.
This makes them a bigger target for data thieves and hackers.
This explains some of the more recent security holes being discovered and patched.
They are replacing Windows servers as well as Solaris and AIX systems.
The hardware to run them is also a lot cheaper than say a SUN E10k or an RS6000. Any off the shelf Dell Power Edge will do just fine.
While this doesn't fall into the realm of the Virus/Trojan weakness, it falls into the "hackability" of an OS.
Getting back to the desktop world, neither Linux nor OS X have enough exposure at the moment to be considered a real target for hackers.
If say Windows and OS X market share were reversed, hackers and virus writers would be banging away against OS X all day long.
Not saying they would have the same success as they do against Windows, but they sure as hell will have been successful at wreaking havoc on more than a few occasions.
Having blind faith in any OS's security is absurd.
Having blind faith in any company is absurd.
I am a user of many Apple products, although that shouldn't be a requirement to be a member here.
While I like the products, I do not partake of the Steve Jobs "Kool-Aid" that they make perfect products and that they can do no wrong.