Truth doesn't always come from pleasant sources.
I personally believe due to the vastness of the universe it's possible there is intelligent alien life in it. But I do not believe aliens have ever visited Earth any longer than to do a "fly over" and have never adducted anyone or are secretly here. Why? Because any species that achieved interstellar space travel couldn't possibly see humanity in its current state as anything worth wild.
We are vain, greedy, manipulative, jealous, violent, and blood thirsty species. Animals kill for survival we kill for fun yet we're better than them, well that's what happens when you're top of the food chain and get to write the rules.
Everything a villain has ever said about humanity is true. But also, on the flip side we're also hopeful, kind, generous, loving, artistic, clever, and compassionate. That's why I love Star Trek I love the idea that one day we can unite and let go of the negative and move forward with our positives. Yet even Star Trek takes a romanticized view of humanity to almost a colonialist point. The Federation through humanities guidance has brought enlightenment to the universe basically taming the "savages" even the Vulcans in ENT were transformed into a better version of themselves through human intervention.
I love that the Doctor looks at his companions as the best of humanity and through them sees what makes us a worth wild species to invest in. But again, on the flipside Gwen said it best in Torchwood.
https://youtu.be/8FswjRpmFXU
We have a speciesism view of ourselves that of course an ancient being with super intelligence could fall in love with a pretty girl from London with Avenge human intelligence. That makes perfect sense. Or does it make more sense some fans wanted to fantasize about going through Time and Space with their crush and them loving them back?