Yes, absolutely. It becomes trivial once you start thinking outside the planet.
Consider a cluster of space habitats that waves hand had a technological collapse among the human inhabitants - the first move from planets to habitats might have been done with rockets and coilguns and nukes, etc., which aren't a big distance from various advanced weapons, but that was a long time ago and none of that is done anymore.
Maintenance of habitats is fairly easy and could plausibly be done with primitive inhabitants (either low tech tradition is good enough, or high tech automated systems that the humans don't even realize exist), so the lack of rockets, etc., don't need to imply inevitable hab failure either.
Once you're in this setting, space travel becomes easy: just walk out the airlock and kick off the wall. For longer distances, you head out to the surface of the habitat and let go, allowing its rotation to launch you at whatever that tangential velocity is.
This won't be enough delta-v to get you far.... but you might already be somewhere quite interesting. A cluster of habitats that can be traveled between with precise timing of your launch, perhaps. Maybe it is in a moon or ring system with little gravity gradient, meaning you can move around slowly, and it takes a long time to get somewhere, but you don't need high tech rockets.
BTW rockets ARE possible. Pressurized or heated air or water shot out a nozzle produces thrust. That'd foil typical habitat recycling, so you'd need to replenish it, but that's certainly possible to do. Not great rocket performance, but again, might be good enough for a friendly setting.
Can that make a weapon? Sure, but a pretty poor one. You won't bring a Super Soaker to war, and a steam rocket is probably unreasonable anyway.
Oh yeah, and while the fragility of orbital habitats is mostly mythical (they don't instantly fail if there's even a large hole punched in them, though that would need to be repaired), the requirement of maintaining your shared home might just create a disincentive of weaponizing certain technologies anyway.
Bottom line though is I think a lot of people neglect the possibility of changing the physical setting when wanting to engineer a situation. You can always do that, even if wanting to stick within the realms of hard sci-fi - don't feel limited to just natural bodies in the solar system!