A Bulgarian space agency scientist gave his views about aliens that aliens are exist on earth. at this time they can see us but we can not communicate with them.To understand their language humans 10 years.He also have answers of 30 questions those he asked from aliens.According to their answers aliens are positive to us.They love our nature.They communicate with their power of thought.
I think aliens are not good and not bad to us.If they can reach on earth ,they would also reach to other planets with civilizations.Humans are just sample animals for them.They will use human according to their need with time.
In my experience it is difficult for a specie to make a friendly contact with other specie.And this contact is depend on needs and not because of common life essientials.
We have to catch and decode their signals in our language.If we will think our own way of catching and decoding signals we will definitly be able to decode the signals earlier than this time.
This is the thing we have to understand.
