The first. Workers tend to be lazy. How many guys do you see all the time using noisy commercial lawn equipment without any sort of hearing or eye protection? Those guys will all be deaf (if lucky) or have severe tinnitus (if unlucky) by 50.
You see it in factories too, where workers will disable safety devices just to save them a tiny amount of movement.
are you saying that wearing the PPE is simple and easy to do, or did you mean they don't wear PPE because the job is so simple and easy to do?