Lois Lane and the spear of bad writing

It seems that Lois Lane’s destiny was to provide Superman with reason upon reason to be distracted. But the cherry on top came when she threw the kryptonite spear without any reason into water, only to try and retrieve it, and nearly drown, a couple of minutes later.
We understand that she believed it was the only thing that could hurt Clark Kent. But we also understand that kryptonite lays unguarded in the ocean, for any kid to find it. So…
And then she tries to take it back and what? Impale Doomsday herself? At least go anywhere near the battle between the Gods (and one Batman)? Was that supposed to be heroic? Well, it was plain stupid. If we are upset about something in Batman v Superman, then that is the fact that Lois Lane was utterly useless.
Amy Adams could have done much more with such a character – but all she was needed to do is scream.
