[ericthered]

The parachronic KKV has its uses, primarily that its a WMD that can't fail. Or at least can't be reverse engineered when it fails. Operation Firefall (the plan to attack Reich-5) was tabled because they calculated that at least one conveyor would be captured. With a KKV, you might miss, but even on a miss it will impact the earth and be totally destroyed, not turn into a dud waiting for the enemy to capture and analyze it. Even the worst disasters either send it into orbit at impossible to follow speeds or hit the wrong alternate (you're doing this on an empty world, right?).

Its not an option you take lightly, but you do occasionally find worlds like Steel, where it actually looks like a decent option, and the only safe one.