The main point you miss is that the main goal of all this is to get a better negotiation position on Earth with our own superintelligence (and there are high chances that it will be soon and misaligned)- which at early stages will also very uncertain about aliens detraction in the universe. It is like crying into an open window—“a guy, Jack, is in my room and is going to kill me!” You don’t know if there is police outside—but you hope to affect Jack’s calculus.
But, even if I accept that, it doesn’t change the fact that a radio broadcast is unnecessary due to points (4) and (6). Doing the radio broadcast or not wouldn’t change anything.
The main point you miss is that the main goal of all this is to get a better negotiation position on Earth with our own superintelligence (and there are high chances that it will be soon and misaligned)- which at early stages will also very uncertain about aliens detraction in the universe. It is like crying into an open window—“a guy, Jack, is in my room and is going to kill me!” You don’t know if there is police outside—but you hope to affect Jack’s calculus.
But, even if I accept that, it doesn’t change the fact that a radio broadcast is unnecessary due to points (4) and (6). Doing the radio broadcast or not wouldn’t change anything.