Re-reading your own message should definitely be a bell for you to notice either your lack of trust in others and/or your twisted perspective that work is the goal of life.
Unless you are the one paying for that person and they are not performing as by contract, even if someone needs an extra day off to chill, you should be happy they do take it as it creates an environment where you also could take it off if you so wished.
I’m neutral on this topic between you and GP, but I do think you’re discounting the fact that distrust can be legitimate. You’re assuming that we should trust blindly, it seems.
I don't think they're discounting that distrust can be legitimate, they're questioning whether it's useful to distrust somebody when it's not your job to micromanage them or they're providing adequate output.
Unless you are the one paying for that person and they are not performing as by contract, even if someone needs an extra day off to chill, you should be happy they do take it as it creates an environment where you also could take it off if you so wished.