When one truly believes:
0) Subjecting fruitfly life to this kind of treatment is unethical.
1) Life is just physics in action.
2) Physics are just algorithm (or our physical world is a simulation)
It is not hard to understand why they think it is unethical.
My question are
1) is all life equal?
2) is all suffering unethical?
3) is this world materialistic or are there something out there?
4) should a list of items begin with 0 or 1?
If life is physics and physics is an algorithm, it doesn't follow that an algorithm reproducing the physics of life contains life, even if we grant that it actually reproduces it completely and perfectly. That's just confusing the symbol for the thing.