Given physics (the abundance of raw materials and energy + the ease of building computers), you're in a simulation*. So the physics you observe is made-up -- the nature of the physics that you observe gives you very little information about the nature of 'real' physics. So arguments of the form "Because physics, ..." fail because you have no reliable information about physics. The simulation argument itself is an argument of this form ("Because physics, simulations"*), and so it fails, having defeated itself.
* Abbreviated form of the normal simulation argument.
* 100 billion galaxies
* 100 billion stars per galaxy
* 1 billionth of the sun's light falls on Earth.
* Biology uses a trillion times more energy than the Landauer limit requires.
Just between those four factors, there's room in the universe for ~10,000,000,000,000,000,000,000,000,000,000,000,000,000,000 human-like beings.
There are currently far fewer than that. If we do not destroy ourselves, we will bring into existence some portion of that figure. To the extent that we who are alive today prefer existence to non-existence, that will be a good thing.
Oops. I've made an error in my calculation! Can you spot it?
I forgot to multiply by the Earth's current population!
Corrected figure: ~100,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 human-like beings.
... Except, I can't really tell the difference. Both figures just look like "a lot" of zeros. The 53rd zero just doesn't have the same emotional impact that the first zero has, even though it has the same arithmetical impact.
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