Several things: Rimmer happily orders the deaths of the waxdroids, who are just as 'alive' as Katerina. Rimmer's not someone who values humanity... ...particularly when it's kill-or-be-killed. If she'd had a hologram-killing gun to his head (which she does, metaphorically), he'd have been positively justified. He pushed a hardlight hologram in front of a vehicle. With his experience, he couldn't be sure it would kill her. (Though originally we were meant to have seen a shattered light-bee, which makes it more definite. As-short, she could be a mile down the road, imbedded in he bumper of a Land Rover.) Given the circumstances, what alternative did he have? But the main thing is: the efficiency of what he does - the speed, the practicality, the sheer competence - is the equivalent of Lister being able to read Chinese in the next scene. It's a little more 'capable' than the guys usually are. Defeating his nemesis is Rimmer's path to bliss - it leads him towards the joy promised by the ink.