It's a metaphor, it means that the reason society is sometimes wary of Science is because has a habit of doing things just because it's a good idea at the time, after all, we don't send death-row prisoners off to be tested on until they die for a reason, it's inhumane, even though it's scientifically sensible.
Look at the state the UK is now in because it was 'efficient' to use technology to put cameras on every street corner, it's certainly a scientific solution, not a human one, and it's caused nothing but trouble. Look at ID tags, Microwave crowd suppression devices etc, all of them scientifically viable, Science can be a bigger monster in the closet than Religion can, because the nature of Science is that it works.
Science thinks about the tool, not the hand that wields it, and that's it's weakness, it doesn't deal with people, it deals with cold, hard facts, and that's the one thing that people aren't.