If you think that professional bass tournament fisherman would never use live bait (outside of tournaments), then you're missing out. Most tournaments have few restrictions on pre-tournament fishing techniques. Some bass anglers use bait either to find fish so they can catch them with artificials or they use it to chum an area to hold fish. Is that unethical? The rules don't prevent it. Besides, you still have to hope the weather does't trump your chum. If the shad move out, if the crayfish get scarce, etc. then you can bet you don't have enough minnows to keep 'em there.
After all, what is it about fishing that draws us back? It's about catching fish!
Now what compels us to fish tournaments? It's about showing our superior prowess in catching fish within the limits of the rules. If the rules allowed live bait, some anglers would use it and some would not. Just look at walleye/saugeye tournaments. Sometimes live bait is just not as efficient as artificial. What it comes down to is that the B.A.S.S. movement of the 1970's painted an illusion that good fisherman don't need or even use live bait, nets, and so on.
If bass fishermen (or any purist for that matter) are so ethical and knowledgeable, then they shouldn't use depthfinders, GPS, graphite rods, trollilng motors, rain gear, sun screen, bug repellant, or polarized sunglasses. In fact, maybe the catfish "noodlers"/"grabblers" are the epitome of a true fisherman

Can you say "Git 'R Dun!"?