NM starts disabled after system crash (hard power off)

[Andrey Borzenkov <arvidjaar gmail com>]

Unfortunately, I still experience occasional lockups which require me to 
press power off button. What I find annoying - NM consistently comes up 
disabled after this. Simple "cnetworkmanager -o yes" is enough, but I am 
curious - why? Is it intentional design decision or should it be 
considered a bug? How NM decides it should be disabled in the first 
place?