All right, JS, yes you do have a point. Since Visser One has laid the groundwork for invading humanity, I believe she would admit that appealing to humanity's requirement of having someone else solve all of their problems would be an ideal way to go.
However, something as dramatic and risky as a world wide announcement would be too dangerous.
Remember, the whole trying to get Russia and China to start a war thing was the newly promoted Visser One's idea. And the reason the Council of Thirteen agreed with the old V1's policy of a passive invasion was that a major war on Earth would likely draw the attention of the Andalites, who were amassing their fleet and getting ready to make a decisive move.
You say that nations of the world would not be stupid enough to strike at an alien force. I could not disagree with you more on that part. Remember, at the time of 1990 when Visser One had the Sharing going, the US and Russia were all ready in a Cold War. The only reason we did not fire on each other with nukes was because of our mutually assured destruction. To quote WOPR: "The only way to win is not to play."
That does not mean we were not ready to push buttons when the time came. We all ready see what happened when a false news report of an alien invasion got taken the wrong way. It was right after World War One and people were jittery as all hell. It had nothing to do with aliens so much as it did the crippling fear that someone, from somewhere, with power and intentions that were too frightening to imagine, were getting ready to invade the country. That caused a massive panic among the masses.
Now, look at Russia and America. Both countries are filled with civilians who are being told that the other nation is poised to fire nukes at them. Tensions are as high.
Suddenly your announcement goes out. It doesn't matter what your intention is, people panic. Because while a handful of people might think, "Cool Star Trek." The rest of the population is freaking the hell out.
Riots in the cities as people hoard groceries and other toiletries. People stock piling ammunition and freaking out over the slightest sound, the glint of street light off of someone's approaching vehicle, or a helicopter in the air.
That riot causes a lot of noise. People are needlessly harmed, hospitals become overworked. Military efforts are pressed into service to control the crowds and are not watching the skies.
So, you might think, perfect. They won't be watching for our invasion. Except your passive invasion has pretty much just been flushed down the toilet. And any overt attack on your part could draw the kind of attention the Council doesn't want.
For the sake of safety, the passive nobody knows invasion is the best way to go. Even the Animorphs caught on that it wasn't such a good idea to expose the Yeerks for fear of a no kid's glove invasion.
Now, that doesn't mean it wouldn't be a good idea to try and infest a government official. A mayor, or a councilman. Someone who can influence a vast number of people in a short amount of time.
One of my other minor plans is to financially back a candidate of my choice for election to high office. This way we now have someone in charge of zoning, distribution of finances, and the thing the Yeerks need most of all, access to hosts.