Luke_A_Somers comments on Morality of Doing Simulations Is Not Coherent [SOLVED, INVALID] - Less Wrong
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But a miracle occurs, and your physics simulation still works accurately for the individual components...?
I get that your assumption of "linear physics" gives you this. But I don't see any reason to believe that physics is "linear" in this very weird sense. In general, when you do calculations with garbage, you get garbage. If I time-evolve a simulation of (my house plus a bomb) for an hour, then remove all the bomb components at the end, I definitely do not get the same result as running a simulation with no bomb.
Well, actually, physics appears to be perfectly linear... if you work purely quantum level. In which case adding R is just simulating R, and also simulating you, pretty much independently. In which case no, it isn't garbage. It's two worlds being simulated in parallel.