You will get 20 opinions on this one.
I personally like the concept of performing a visual check and view a wire that has some slack in it (i.e. a slight curve). If it's taut/straight, then something isn't right (i.e. it's loosening ever so slightly). At speed, that safety wire won't really keep the spinner on. But if you at least have a visual before you fire her up, you have some more peace of mind. Some here will give each spinner a good whack before each drive. If you install them properly that really isn't necessary (but, again, if it gives the person peace of mind then you do it just because).
-Dean