My gut instincts say that it's both. Active fish are there, potentially feeding on or on the prowl for their normal food source ... whether we are, or not. We send "our" imitations into the mix and they may get taken. Inactive fish may also be there, and may become active upon watching the others feed or may be coaxed into taking our imitations should we present them in close proximity to their "personal space". Now, whether they are "biting" these imitations to eat them, kill them, or scare them away from that "space" is of little consequence to us, the anglers, as long as they give us a cue as to having taken the offering into their mouths long enough for us to set the hook.
I've never believed Crappie are "smart", they just have survival instincts. They're governed by their surroundings & conditions, and they must feed & breed to survive & perpetuate their species. They must also be cognizant of the fact that they too can be prey to larger predators. I've also never believed that they "remember" or "learn" to avoid certain baits, hooks, line color, or even certain scents.
... cp