You're still stuck on the notion of acceleration. Relativity is silent on warp drives and hyper drives.
Half right. In general relativity those things are covered under "non-inertial reference frames" or "moving coordinate systems." The best known of those is called "gravity," which is a specific type of warped space caused by the presence of a point mass.
"Warp drive" is not a real thing. Neither is hyper drive, folding space, teleportation, wizard magic or vampires. So in a sense you're correct, relativity is indeed silent on fictional things that don't exist.
Time travel paradoxes are one of the standard arguments against FTL.
That may be, but time travel paradoxes aren't the REASON you can't exceed the speed of light. They're one of the reasons why exceeding the speed of light
would be really really weird if it were possible.
It's NOT possible, so the paradoxes are irrelevant.
If you can do FTL in an arbitrary reference frame...
You can't. You can only observe SOMETHING ELSE doing FTL in a non-inertial reference frame such that your coordinate system includes a highly curved spacetime. This is the reason YOU cannot achieve FTL velocity, because as soon as you move into that curved space, it is no longer curved (and the object that was moving at FTL from your previous position no longer is in your new position). FTL in that context is a feature of highly warped coordinate systems, like in the proximity of a black hole or on cosmological scales.
You see this happen when you actually calculate the field equations: it's a "grass is greener" type thing. A highly curved space time may include a set of coordinates where all objects appear to be moving away from you at FTL velocity, but that just means that if YOU moved to those coordinates, the place you ORIGINALLY WERE would be in a curved spacetime and still moving away from you at FTL velocity. Because your observations are only valid from exactly where you ARE, it remains true that YOU can never reach FTL velocity with respect to any other object in the same coordinate system, even though other objects can (appear to) do exactly that.
All the paradoxes you keep mentioning are not OBSTACLES to FTL travel, they are EXAMPLES that (attempt to) show why FTL travel doesn't really happen. Saying "paradoxes are what prevents FTL" is a bit like saying "Silence is what prevents noise."
You could have a dispersal device that isn't destroyed when it functions.
Such a device would not, by definition, leave a large impact crater.
Depending on how hard the landing surface was. Most of the weight of the device would remain.
I think you mean "mass" and no it would not. A 500kg object broken up into 500 pieces is no longer a 500kg object. Each separate piece is now a 1kg object traveling on a separate trajectory. Which means for all practical purposes, the impact physics of each of those objects is independent of its neighbors.
Physics dude. Do the math:
Steel projectile of 1kg falling from a height of 400 meters hits the ground at 88.2 meters per second and has a kinetic energy of a little under 3000 joules.
Drop 1000 of these 1kg projectiles from the same height, all in slightly different locations. EACH ONE has the kinetic energy of only about 3000 joules.
For comparison sake: a 9mm bullet fired from something like a Glock-39 has a muzzle energy of about 500 joules. In other words, these 3000 steel balls each hit the ground with the kinetic energy of a rifle bullet.
If, on the other hand, you take a 1000kg steel projectile and drop it from the same height, it hits the ground with the kinetic energy of 3000 kilojoules. This is equivalent to about a bucket of TNT. While the mass of energy is generally the same, all that energy concentrated into one place means the impact force is far greater beneath the one-ton object than it is beneath the kilogram-sized objects.
Shit like this is why hail storms don't have massive body counts or bloody aftermath, after all. 100kg of ice literally falls out of the sky and lands on the roof of my car; as long as it doesn't land ALL AT ONCE, my car will be just fine (it won't even crack the sunroof).
Conclusion: a single crater at ground zero means a single, high-energy event, not thousands of low-energy ones. If the device exploded in the air, there won't be a crater. If the device exploded on ground level -- or hit with enough kinetic energy to excavate a crater on its own -- then it is extremely unlikely to be a specially-designed chemical weapon munition. That narrows it down to two possibilities: either a store of nerve gas, held in reserve by terrorists, was hit by a conventional munition and spread over a wide area by the resulting blast, or a badly improvised chemical munition was dropped from an airplane for reasons yet to be determined. Neither of those scenarios is directly supported by the evidence, and the latter isn't even the most plausible conclusion.