Ok - If someone was going to plant a bomb on a beach, would they put it as far away from people as possible under two giant boulders? Wouldn't be very effective. They would probably leave it in a picnic basket or something. You don't see the bomb squad being called out for every forgotten picnic basket.
Sure they're going with the most cautious approach here, and maybe they have some operating rules that require them to treat all callouts with the same approach. But, using common sense again, is there a threat level at Lake Herkert that requires that sort of elevated sense of caution. I'd say not.
PS - It goes without saying that Shabadu does not condone any sort of terrorist activity, or forgetting your picnic basket on a beach.