Personally I raise my own ASF rats and I pre-kill them for my snakes. I know there are still possible risks involved here, but raising my own does greatly diminish the risks of parasites since I haven't introduced any new blood in quite awhile. I even raise extra rats and try to supplement my cat's diet a couple days a week with pre-killed rats (holistic is 10x healthier for cats than kibble, and one day I hope to have enough of a constant surplus to have them be totally converted, then when we get a house we're planning on getting a ferret which will be fed holistically as well).
Now generally people put "Please don't flame me" in right about now, but that usually incites flames, so I'll just set my opinion carefully down here and offer up the promise that I will graciously accept any contradictions of my methods and even be nice in response
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As for that lady having a "mouse-killing fetish" I still feel bad each and every single time I kill a rat. I know it's food for my snakes so I do it, and healthy for my cats, but I don't enjoy it. I've gotten more used to it, but I in no way enjoy it and a lot of the time I still get those stomach crinklies.
Now one of my reasons for feeding pre-killed is convenience, considering my rats are right outside the snake room, and the freezer is upstairs (plus thawing takes forever!). I don't pretend that I'm not just a teeny-tad bit lazy after working all day, however, my main reason is that I do buy into the theory that frozen/thawed isn't as healthy. In fact I find it down-right disgusting. Maybe I've just gotten bad frozen mice in the past, but (and I've used this scenario before) if I was lost in the woods and had to catch a rat to eat, I may very well do it.. but if someone showed up who thawed a frozen rat for me and said "Here, eat it", I'd rather starve. Those things are the most vile, disgusting things I've ever seen/smelled and I wouldn't wish it on anyone, let alone the snakes and cats that I love so much.