I understood your justifications and that's what I was responding to.

1. There are significant technological barriers to pure fusion weapons and fission implosion triggers would always probably be the cheaper option. Laser-initiated fusion is known to be unworkable; experiments have indicated that at least 10 MJ of laser energy - and probably 2 or 3 times that - is required for reliable fusion ignition; this is far beyond the capabilities of current laser technology to produce in a compact way (the NIF is a huge installation and only produces 1.8 MJ of laser energy). Antimatter-triggered fusion might be possible but we are still far from producing the amount of antimatter required (at least a billion atoms; we've currently only been able to produce about 100 atoms confined for a few minutes).

2. You mention "Deuterium in lakes and ice has higher concentration" and "Lithium in dry lakes", referring to Earth. As for Jupiter, I wouldn't worry too much about it.

3. The Russians are known to put out a lot of misleading information; I would take those reports with a grain of salt (ahem). Fact is, most current bombs have a secondary pusher/tamper made of Uranium-238 and this produces nuclear isotopes that are more dangerous and far more plentiful than a cobalt blanket ever would. I fail to see the point of a 'stationary doomsday device' as nuclear ICBMs are far more dangerous (and they already exist).