The galaxy is ~100,000 light years across and likely to contain at least 100 billion planets, of which we've only just developed the ability to even detect the existence of ones substantially closer than 1000 light years without assistance from gravitational lensing, i.e. in less than a millionth of the volume of the galaxy.
AFAIK (my knowledge is not encyclopedic), the most energetic event in the Star Wars universe is the Death Star destroying planets. Novae are many orders of magnitude more energetic than that and are estimated to happen 80 or so times a year in the Milky Way. We manage to detect 3-4 of those, generally well after the fact, and AFAIK have only observed one happen live once. The Death Star could go on a shooting spree and we'd be vanishingly unlikely to notice.
And as far as electromagnetic broadcasts are concerned, their intensity falls off with the square of distance unless they are directed. Unless ET were to point a hyper-powerful (but hopefully not Death Star level) laser directly at us, we'd be extremely unlikely to have detected their broadcasts by now.
Space is really, really, really big. Big enough by far to make "if aliens are common why haven't we seen them yet?" a question with a trivial, obvious answer. It's the same answer a kid who's just had their first swim in the sea gets when they ask "why weren't there any whales?"
Edit: There are other things that rule out Stars Wars and Star Trek though, ofc. The speed of light isn't really a speed limit (or a speed, as such) and special relativity doesn't prevent you from reaching the stars in your lifetime or even from hopping to another star in a second, but the different time spans experienced by people on different world lines aren't optional.
If intelligent life were that common, and interstellar travel that easy, colonization of the galaxy would have gone to completion billions of years ago. We would never have evolved; Earth and the solar system would long since have been converted to an urban area.
Those fictional places exist purely for the telling of stories, not because they're plausible or internally consistent.
They're not plausible or internally consistent for reasons in my edit. It's not the Fermi "paradox" that rules them out. There could easily be interstellar civilisations in the Milky Way that we haven't observed. They just wouldn't work anything like the ones in Star (Wars|Trek).
It's implausible if life tends to spread out. Your scenario there has to assume a universal rule that it never does that, anytime in the past billions of years. That's simply not plausible, especially in fictional universes where in the current times all sorts of species are doing just that.
The galaxy is ~100,000 light years across and likely to contain at least 100 billion planets, of which we've only just developed the ability to even detect the existence of ones substantially closer than 1000 light years without assistance from gravitational lensing, i.e. in less than a millionth of the volume of the galaxy.
AFAIK (my knowledge is not encyclopedic), the most energetic event in the Star Wars universe is the Death Star destroying planets. Novae are many orders of magnitude more energetic than that and are estimated to happen 80 or so times a year in the Milky Way. We manage to detect 3-4 of those, generally well after the fact, and AFAIK have only observed one happen live once. The Death Star could go on a shooting spree and we'd be vanishingly unlikely to notice.
And as far as electromagnetic broadcasts are concerned, their intensity falls off with the square of distance unless they are directed. Unless ET were to point a hyper-powerful (but hopefully not Death Star level) laser directly at us, we'd be extremely unlikely to have detected their broadcasts by now.
Space is really, really, really big. Big enough by far to make "if aliens are common why haven't we seen them yet?" a question with a trivial, obvious answer. It's the same answer a kid who's just had their first swim in the sea gets when they ask "why weren't there any whales?"
Edit: There are other things that rule out Stars Wars and Star Trek though, ofc. The speed of light isn't really a speed limit (or a speed, as such) and special relativity doesn't prevent you from reaching the stars in your lifetime or even from hopping to another star in a second, but the different time spans experienced by people on different world lines aren't optional.