It might not be desirable for an alien race. That is assuming that they are aliens and not time travellers. In any case, you can't just colonise a planet with life on it. Imagine the potential problems for a race who was born on a different planet.

Too many presumptions, not enough information.

Just a hunch. It may be nothing. Got a feeling this thread may grow this month.
A mate of mine tipped me off there was something recently in The Daily Mail.
I found this

[Link]

“Donald Trump was about to open up about Alien’s existence, but Alien in the Galactic Federation said, ‘Wait, let people calm down first . They don’t want to start a massive frenzy. They want to make us smarter first,” Haim Eshed, who worked in Israel’s space security program from 1981 to 2010, said. .

I'd say that initially and predominently the whole "Trump is about to reveal the truth about aliens!" was just another QAnon type angle to get the untethered from reality on-side.

Not that I'm saying that alien life doesn't exist though, it almost certainly does. Whether it's been here is an open question though. I do always find the 'Gold Standard' of Roswell amusing. The idea that an alien race with super advanced technology beyond our wildest dreams would get here then promptly crashland is a rather curious thought.

You can get away with a couple of pints on the route to their part of the Galaxy.
Not many old bill about.

There are loads of UFO's reported every year. My dad flew in surveillance aircraft for the RAF in the 1970's and his flight logs have a few sightings, with the occasional photo.

As for any alien landings, I doubt anyone could keep that a secret for very long.

I disengage, I turn the page.

It's a broad term really - UFO. It doesn't necessarily imply that they're from a different planet. It could be advanced technology, ours, Russias, Chinas who knows. Interesting all the same.