....I undertsnad your frustration...
....but having said that...that person who comes in rain or shine, healthy or vomiting ill, may be losing their house, barely able to provide food/clothes/other necessities for a child/children...or have medical bills overtaking their life from an ill relative...
....these reasons may lead them to not have an option of taking off work...especially if they do not have family or a working spouse to compensate for the time they are losing at work...
...not everything can revolve around what annoys US, personally, because they may be a LOT worse off than just coming to work sick...