Its always fun to speculate and raise science fiction gossip to the level of proven science. However space time folding and for that matter wormholes are at best theoretical, unproven concepts and no credible physicist would tell you they are known to exist or even be likely.
Also, the amount of energy\mass to do space-time folding would release enough energy to cook if not obliterate the earth.
Because they have not evolved to the point of understanding it. And in their egotistical arrogance they think they they know it all. When in reality there are things that they will never understand. In no way can we judge the capabilities of these entities based on our own primitive understandings.
90% of physicists can’t even figure out how to change their own spare tire even with instructions (fact). What we are talking about here is technology that could be tens of thousands of years or more ahead of our own.
These craft and entities have been flying around since before the beginning of man. Man doesn’t know zip compared to these entities. We are primitive and they are our zookeepers...
“However space time folding and for that matter wormholes are at best theoretical, unproven concepts and no credible physicist would tell you they are known to exist or even be likely.”
“Credible physicists” of the 1700s would have told you that almost all of modern physics is “not known to exist or even be likely”.