I realize you can just answer, “mysterious aliens beyond our understanding,” but why would a space probe have a mandate of either talk to a whale for 30 seconds or destroy Earth and disable everything in its path on the way to Earth?
Why? What does that achieve?
The problem here is that it wants to talk to the whales but it is also destroying the ocean. That doesn’t really match your scenario.
It’s just an overgeneralization. It’s doing something it thinks is harmless and possibly considering humans to be lesser beings like the insects
It’s doing something it thinks is harmless that would directly harm the thing it’s wants to talk to?
Are its programmers morons?