It's not even just that, they believe that people on government assistance need to be constantly shamed and humiliated, otherwise they will never have the motivation to pull themselves out of poverty.
I had an argument with a big-L "Libertarian" acquaintance who straight up admitted that he would rather pay more in taxes to implement new stricter oversight and systems to restrict what people spend their WIC/SNAP benefits on than endure the possibility that someone might buy a bag of Doritos with said assistance. The cherry on top was him--again, a "Libertarian"--claiming it would be to ensure they are making healthy, state-approved, food choices.