If you're going to argue that deep down, then yes, you're right.
You're forgetting the most important things when it comes to OS security though: the users. Tell me, and be honest and unbiased (as I am, I really just prefer Ubuntu over anything); do you think the average OS X user would be more security-savvy than the average Windows 7 user? W7 throws recommendations at you (firewall, network security, passwords, etc) whereas, as far as I know, OS X doesn't make you install a firewall or AV software. I mean, really man, are you really trying to tell me that, comparing average installation of Windows vs. OS X, the latter is more secure? Linux is another kettle of fish to analyse, btw.
(Also, I wouldn't argue subjectivity and bias when some of your first few lines are subjective and bias) 
A few things:
- OSX comes with a default firewall, just like how Windows comes with Windows firewall.
- OSX 10.7 runs applications in sandboxes. It doesn't need AV because the usual virus poses no harm, it cannot access other processes or modify the system unless you give it explicit permission. Sure, your cc details stored in plain text on the desktop is still vulnerable, but if that's the case you deserve to have your cc details stolen.
- There are only three ways to get a virus. Porn, warez and things that are too good to be true. You simply need to use common sense and not be stupid. I have been surfing the net naked for 5 years now, still virus free.

[There is a 4th way, via malware that pretend to be AV, I think this falls in the common sense category]
A few things that I don't think have been mentioned:
- Once you learn how to use Spaces/Expose/Mission-Control/whatever-name with the keyboard or multitouch, you will
never go back to Windows. For multitasking, I have never seen anything better.
- A large range of good media tools are available only on Mac (e.g. XLD for music encoding), while there are no comparable Windows equivalent.
- Built-in shell is enormously powerful, unlike Windows, which largely constraints the user to the GUI (CMD is mostly useless, registry is a mess, shell installation is lengthy via cygwin/equivalent). For a programmer, the availability of shell makes life a lot easier, without needing to use heavy IDEs like Windows.
- Their warranty and after-sale services are amazing, and the machine is very reliable. This is highly attractive to institutions (which didn't ask Indian software companies to write them custom software in x86).
The OSX platform has only really matured since Leopard/Snow Leopard (~4 years ago), after the success of the iPod which allowed Apple to put extra cash in developing their desktop OS.
For the low-end user who uses the computer for simple tasks and want an easy-to-maintain and hard-to-accidentally-break computer, Macs are ideal. For the high-end user who spend most of their time
working, Macs are also ideal. For the average user who wants to 'own' a computer, be able to modify it, want it to have the potential to do a wide range of functions, and want it for the lowest price possible, Mac is probably the worst choice.