Drives IMTU

[ak_aramis]

Any practical interplanetary ship is inherently also a potential WMD. You cannot escape that and still be realistic. Crash a 2nd stage from a Falcon 9 into a major or semi-major city, and thousands will be injured from the blast and resulting fires. Even if it were filled with only water, it's going to have a nasty load of kinetic energy, simply to overcome gravity for a suborbital path like the 1st stage has.

Hit a small town, it may only be hundreds, but it's still going to do damage much like an FAE, and those are now banned as WMDs.