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this post was submitted on 14 Nov 2023
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Science fiction always challenges my suspension of disbelief is when people land on planets to skirmish with conventional weapons instead of, say, throw a big heavy aerodynamic solid rock from space.
In the Expanse series Earth and Mars are at war. They can easily throw rocks and totally destroy the other side. Not just beat them in a war, like totally wipe them out. But Mars knows if they start throwing rocks all bets are off and Earth will wipe them out. Just as Earth knows the same, if they wipe out Mars, Mars will make sure the Earth is destroyed.
It's an analogy of the current situation we have with nuclear weapons. During the Cold War Russia made sure they could wipe out the US if the US ever tried a first strike and the US made sure they could wipe out Russia if they ever tried something. The Mutually Assured Destruction (MAD) prevented anyone from taking the first step. These days the playing field is a bit more complex, but the same principles hold for now.
Of course in the Expanse there is a third party with nothing to lose that at one point employs such a weapon of mass destruction. But let's just hope that part isn't a mirror for reality.
I see you've skipped the most advanced detection and targeting systems connected to a network of orbital railguns, and the fact all of that is constantly pointed at Mars in case they launch stealth nukes. Inarocks are not a valid war strategy, and only extreme levels of preparation and corruption allowed a few chunks to hit Earth.
You can make good reasons or at least plausible ones. 40k has planetary shields. There could be a civil war so neither side might want to destroy the surfaces of each planet and civilians. Battletech has spaceship tech being rare and irreplacable, and there are treaties limiting orbital and nuclear bombardment.
Sometimes the most realistic route just isnt fun though so i can usually look past the contrivances.
Good sci-fi usually treats this on par with using nuclear weapons (which it kinda is?). In Babylon 5, mass drivers are banned by intergalactic treaty, and when one race uses them anyway it literally bombs their victims back into the stone age, and it's treated as a horrifying event --one of the character's defining moments in the show is just him looking on silently in horror.
Kinetic drives are mass drivers. Unless you use some kind of teleportation or space warping for travel, every ship is a weapon of mass destruction. Every old boat is a surprise WMD, every craft a viable nuke with zero preparation.