What is the argument and logical content of the poem?

In the poem "Siren Song," Margaret Atwood uses the Greek myth of the siren, who lures men "to leap overboard in squadrons / though they see the beached skulls," to provide a vehicle for her core argument. In the poem, which is written in the voice of the Siren herself, Atwood argues that the "secret" of this siren song, which can induce men to leap into obvious danger where many have evidently suffered before them, is a "boring song, but it works every time." The core of the song is that the siren is saying

Help me!Only you, only you can,you are unique.

The argument of the poem, then, is that the desire to be considered unique—to be the only person who can help someone else—can induce us to throw ourselves into danger despite all available evidence that we will fail. This cry for help appeals to the sense of exceptionalism in us, which makes us feel that, although "beached skulls" lie before us, whatever has happened to others will not happen to us. In our desire to be "unique / at last," we will continually attempt to help people who cannot be helped and allow ourselves to be lured into situations from which nobody before us has ever been known to escape. For the sake of ego, we will leap into uncharted waters "every time."