Well it iS effective against tanks! That just should not be confused with being more effective against tanks than a normal nuke, and in turn that should not be confused with the strategic purpose of the weapon.
Anyway, the ineligibility thing seems weird to me. I think you have to be in active rebellion for that law to apply; not just having talked your mouth off about stuff.
actually, the Canadian context might be enlightening on this issue.
We have had a seperatist party in our federal parliment for decades, and at times one has run an entire province (referendums on seperation have been held). Frankly, I can't see a good reason to deny these people the right to hold office.
In fact, even in full out rebellion, if people are willing to sit down and discuss issues in parliment, and are elected, how is it possibly democratic to refuse them office? It seems far more fascist to say "because you believe X you can't be in government" than to allow people with diverse and conflicting views to hold office.