Many of the CNAs where I worked were--because they didn't care to now or understand the significance behind what they were actually doing. They walked around and did tasks-VS, Blood sugar, Bathe, Toilet- they didn't realize what they were doing and why, they just came to work and did their time 8 hour and left. It wasn't just me that felt this way, many of the other nurses too. Many were so miserable and just dragged their feet all day, wondering when the next task would arise.
I'm not trying to bash CNAs, but a lot of the ones I worked with, were so difficult and just didn't care about their job or the patients. It was sad.