They are not just one entity or species. There are several. I think there are both righteous and evil entities. And one is protecting us from the other. It is wrong to stereotype them all as evil. Just look at all the events in the Bible that might be metaphorically theorized to be UFO encounters like Ezekiel. They are all positive interactions. So how can they be all classified so easily as evil demons?
I agree with you re: that comment.