Magical concepts from science fiction, sorry theoretical concepts from educated guesses based on current (incomplete, unproven, un-seen) understandings of the universe. If such things existed intelligent life would have used them to reach us.
"If such things existed intelligent life would have used them to reach us."
For what reason would we be a magnet for everything out there to have to come visit us (the assumption being that if they don't visit us it can't be possible because we are somehow too important to ignore)? It's a rather flawed basis for an argument.
Our communications out don't speed up getting to them because their ability to get to us has. There is no reason to assume anyone knows we exist yet.
The assumption is if you have a FTL civilization you vary quickly grow to the point where you go just abut everywhere you can reach with FTL travel, unless something else was already there to defend it. Extinction becomes really hard when individuals are being sent out faster than just about anything that could catch them.
Maybe they wouldn't be interested in us. Certainly there are some people here on this Earth that I wouldn't want to meet (for instance some of my relatives).
They have may be a very correct prediction that we are a parasite-like race in terms of spiritual advancement and do not live in harmony with our provided environment, and thus, it is best to not touch us till we learn to not kill everything we touch for our own pleasure.
There may be many reasons why an alien race does not automatically make contact, some of which are actually unknown to us. If you have difficulty swallowing the "some things can be unknown to us" thought, believe it or not, you have an ego problem.
