Sure, they're so far advanced that we can't see them, and they just came over here to chill. Like a nice vacation for them. No desire to extinguish us or talk to us. Just hanging out.
Still, you can find explanations fitting the observations. Like the ant analogy, a scientist is not going to try to communicate with ants. They want to observe without disturbing the ants too much, even if the scientist doesn't take too much precautions to make themselves completely invisible.
See people trying to communicate with dolphins, monkeys, chimps, octopuses, cats, dogs, crows, ...
It's not given that other life forms would be interested in us, they might've learned what they needed a long time ago. And now we're just part of their environment. Or they realize we're too stupid and would just try to kill them so they don't.
Ants do communicate, a lot in fact (chemically). How else would they coordinate the colony?
Yet I don't remember hearing about scientists trying to communicate with them, announce our presence, or exchange ideas.
I'm not trying to say there are beings living among us on a spectrum we don't know about, but it's an interesting thought and anyone dismissing it with certainty are closed-minded.
In my experience those people are rarely interesting and can only discuss very shallow topics from perspectives they've been told by others. What's the weather like? Who's fucking who? How's the super bowl going? Especially when they're antagonistic in their rhetoric. Thinking outside the box and pondering the what ifs in life is the only reason we got out of the caves.
Visits from actual beings (that overwise stay incognito), travelling tens or even thousands of light years, hyperadvanced sci-fi technologies like FTL and invisibility (suggested above) and so on, not so much.
If we're going for "with magic, anything's possible" (but just substitute magic with "technology") then sure...
In the last century lots of things that were considered science fiction has become normal parts of our lives. And not that long ago "aliens don't exist" was the default and only crazies believed in them. Now it's mainstream that there is a high probability at least somewhere in the universe, the only argument needed is that we exist, so of course it could happen again or before. We're not as special as we like to think. We've had hearings regarding UFOs (yes, yes, I know it doesn't imply aliens) in the congress.
But if you want to reduce it to magic go ahead. And the part you quoted was regarding them choosing not to communicate with us, if that wasn't clear.
All of those things are within the laws of physics.
>And not that long ago "aliens don't exist" was the default and only crazies believed in them.
The latter is still the case now.
And infrared doesn't? That said it wasn't always in the laws of physics, and they may still be wrong, they have changed in the last century.
> The latter is still the case now.
I'm not sure most people would agree with you, more likely to answer "I don't know, maybe". I find it very strange when people are so certain about uncertain topics, difficult to relate.