Hep C is more than able to survive outside of the body (especially in a little pocket of nutrient-rich fluids) for quite some time (as in weeks). I grant you the odds of contracting it from even sexual contact, never mind casual contact with a condom is extremely low, but it's still a fucking biohazard you shouldn't have to deal with. The odds of being struck and killed by a bullet fired up into the air is vanishingly small too, but it's happened, and since it's unconscionable to randomly discharge your firearm into the air, it's unacceptable too.

Needless to say, when you don't intend to rent your home out as a business, it's equally unacceptable if someone decides to use it as one.

Edit: I... just realized how Freudian my analogy of "discharging firearms into the air" is. I really should get more sleep.