It's always possible to twist an analogy or metaphor out of shape in order to miss its intent. Further on in the discussion Alan Cox likens the discussion of whether or not SELinux should be on by default to what used to be the controversial topic of enabling firewalls by default. A lot of people's work was complicated and interrupted by the addition of firewalls yet I doubt many would wish them to either be less commonly deployed or presented as a confusing choice to novice users at installation time.
The fact is that there IS a kill switch (to use your metaphor) for those that know what they're doing. No one is arguing that SELinux should be made impossible to disable, just that there should not be the equivalent of a button on the dashboard that says "Press to stop the irritating sound that indicates your airbags are malfunctioning. You may then continue on your merry way."
The article also misses out on mentioning the rapid, copious help that seems to emanate from Dan Walsh and the other SELinux devs with fixing policies when bugs are filed in bugzilla.
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