Would it be okay if I tazed them to death? I mean, IMO, they are oxygen bandits.
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“You may shoot me with your words, you may cut me with your eyes, you may kill me with your hatefulness, but still, like air, I'll rise!” ― Maya Angelou
Urine is mostly sterile, it carries very little in way of bacteria or communicable diseases. Blood is, well, BLOOD. Not sterile. Full of nasty pathogens. And yes, I have worked places that bought cheap pads and tampons in bulk and stocked the restroom with them. It was great.
Most blood is sterile as well. Few people carry bloodborne pathogens around, but the diseases those pathogens can cause can be pretty devastating, hence the increased concern about blood and a selection of other body fluids.