Tritium is a pain in the ass to get certifications for because it is so difficult to contain. Even in an airtight setup, it will leak. If you spend a substantial amount of time in lab with a tritium leak, and are inhaling the stuff over months or years, yes it's dangerous, but hydrogen doesn't remain in your body long enough for a single brief exposure to do anything.
Mercury vapor is very hazardous, that doesn't mean a mercury bomb is an effective weapon.
Your points are solid; I accept that this material would not be very effective as a weapon, except maybe in a confined space. But it’s still something whose possession we want to control, so handling and transporting it adds to the cost and complexity of operating a commercial fusion facility.
Mercury vapor is very hazardous, that doesn't mean a mercury bomb is an effective weapon.