Once they get out to the rivers, I agree, it preserves them to take them. So long as they are made available for others to see, not horded like sweets in a greedy childs' pocket. My concern is for sharing the wealth, letting others (or teaching others how to) experience the wonder and awe of this fabulous pre-history.
As with any commodity, the more of it that's available, the less value is in each individual piece and there are vast quantities of some artifacts in some locals, such as the Megladon teeth in the Cooper River.
I'm saying we need to balance, responsibly, the harvesting of artifacts and the public availablity for viewing of examples of what's out there.
The case of the idiot that tried to chisel the whale bone out of the cave wall at Ginnie is a prime example. Obviously there are those out there who feel justified in removing artifacts that others, like myself, feel should be left for all to see.