Alien nomads could destroy earth

[Sailor Steve]

Originally Posted by mapuc

Not so long ago I saw some kind of documentary on the German TV-channel N24 about alien and it that program they were hostile and in many more documentary I have seen, the aliens are hostile.

It wasn't a documentary, even if it claimed to be. Documentaries "document" what is, not what someone imagines might be, no matter how important that someone is.

I have seen some sci-fi movies throughout the years and in most of them the alien is very hostile towards us.

Sci-fi. Short for Science Fiction.

There are some science program where the scientist say alien can't be hostile.

Again there is no "can" or "can't". It's just speculation. Unless there are secrets somebody isn't telling us (and now we're back into conspiracy theories) there is no evidence one way or the other as to whether aliens even exist, let alone how they might act if we meet them. None.