When we're working with humans taking blood draws, we want trained phlebotomy technicians taking blood draws, not because we're monstrously detached from our subjects, but because our expertise is elsewhere (for example, antibody detection).
If you're working with research animals, you want their care (and yes, their deaths) done and supervised by someone who is an expert in that specifically.
Should researchers see the facilities their animals are housed in, and acknowledge the efforts of those workers? Absolutely. But that's hardly because scientists are uncaring - it's a result of things like the animal housing sites often being at the very periphery of campuses, and science generally having not done a good enough job acknowledging the efforts of technicians in all aspects of science, dating back decades.