While cute, it misses the point. If I say a car is coming, it is then up to the person to decide whether they step into the street or not. This is not a rhetorical argument.
You say that the world being deterministic somehow makes “we should be nice to each other” an inescapable conclusion… but really, it's just a framing that lets you escape the existing divisive rhetoric. If it became widespread, we'd get new rhetoric.
Rhetoric doesn't stop a car from running over you no matter how the warning is phrased if you choose to not understand said rhetoric. This is not a rhetorical argument.
The wealthy can't convince you they deserve wealth if they are dead. Does that make more sense now? The idea is that all the words in the world can't hide the truth of a situation and what ends up happening as a result of said situation.
See how well, "Why don't they just eat cake?" turned out.