Radio Frequency

Could sending radio signals into the outer space be a mistake?

So far scientists and astronomers have not detected any radio signals via radio telescopes that belong to an intelligent extraterrestrial life.

I have seen documentaries that show that there are people that send video/audio messages into the outer space by paying money to a specific company that does that.

Since the earliest radio broadcasts, some of these radio waves probably have escaped into the outer space.

So my question is,
since we didn’t yet catch any intelligent extraterrestrial signal via the radio telescopes, could it be possible that even if there is an extraterrestrial intelligent life anywhere near us, they have a reason to remain quite and undetected?

Shouldn’t we also stay quite and not transmit radio signals into outer space and say, "Hello out there, we are here!", because that’s basically what we are doing right now.
Who knows, the extraterrestrials might not be as friendly as we imagine, and shouting that we are here might not be a very smart idea.
But even if the extraterrestrials catch our radio signals, they may figure out where we are, and they might not be very friendly.

First of all, it’s nearly impossible to put out anything in radio waves and not have some of those escape into space. ‘Broadcasting’ is the idea of sending radio waves in all directions. We can’t build a shield around the earth to trap radio waves.

But think about it. Radio waves radiate from a point–that’s one reason they’re called ‘radio’. Their strength decreases with the square of the distance. In other words, if you move double the distance away from the transmitter, you get 1/4 the signal strength. This means that within a few hundred thousand miles the signal is so small as to get lost behind the background radiation.

There are a lot of stories about aliens that come to earth because they’ve seen TV programs or heard radio programs from years ago, and it took that long to reach their home. But this is mostly baloney. If there is intelligent life outside of earth, it would be so far away that our signals couldn’t reach there. The only way they could pick up the signals would be to drive some kind of space ship close to earth, and of course then there would be lots of other ways to tell we were here.

One of the ideas about UFOs, flying saucers, etc., is that if there -is- another planet with intelligent life, it would be so far away we couldn’t even know about it, much less to visit or explore there. If -they- can visit -us- it means that they are way far advanced, so naturally we should be afraid of them. They would be able not only to visit us, but to cloak or disguise themselves so we couldn’t see them, didn’t know they were here. In a case like that, it’s kind of silly to be afraid of them. If they were going to destroy us they would have done it long ago.