We live in a universe
With many realms
Each with their own vibrational frequency
Well I’m not that knowledgeable in string theory but I’m sure that is not exactly what it means
There are other humanoid beings in these realms
Who have learned to encroach into other realms
And will enslave the native population
Through sophisticated means
Why? Slavery is from every perceivable notion bad. It is costly prone to revolts and morally revolting (assuming that morals means don’t do what you don’t want to be done to you)
If it would be „killing to free space“ or „assimilating“ that could work
There are lands in our own realm
Which are being hidden from us
As well as a massive underground network
Possibly but unlikely have you ever seen a molehill? If there was an underground civilization there would be giant molehills everywhere because those inconsiderate molepeople would shovel their sh*t on our lawn.
It is estimated that humans
Can only see 5 percent of the visual light spectrum
Yet people think what they see is all there is
And how do we know this? Because we have machines who can see this light so we would know even if we can’t see it.
Some of these beings share our emotional values
Others are predatory and arrogant in nature
We are in the process of being occupied
And subjected to the whims and oppression
Of a shadow species
That can even manipulate through telepathy
How would other species be able to use telepathy on beings with a totally different Mindset and values? That would be like you driving a car meant for an octopus.
Our notion of freedom
Will become an unimaginable concept
And we will not know anything different
We will lose our own unique culture
And our free will
If we are tricked to upload
Our consciousness into a computer!
While it is possible that we will one day have vastly different ideals than we have now I doubt that you will come to a conclusive argument why extradimensional beings will be the main cause of it, when there are so much better ways like human social evolution or the mentioned technology