Since you asked, and since I am one of the few who said I don't carry a knife in my home, I will answer for myself.
I hardly have any use for a knife in my home. I don't typically experience urgent situations in my home where having a knife on my person would mean the difference between life or death. On the rare occasion that I need a knife, it's easy enough for me to reach over and pick one up, or even GASP! walk into the next room to get one. In fact, if I'm sitting down it's easier to just reach over and pick one up than digging one out of my pocket.
I use scissors far more than I use knives in my home, but I'm not going to carry a pair of scissors around all day in a belt sheath.
I use a flashlight more than I use knives and scissors combined, but I don't carry one of those around all day either. I have several located around my home out in the open where I can just grab one in the dark.
And I use my smart phone far more than I use all of those other things combined, but I don't feel the need to have my phone on my body all day either. In fact, I often intentionally leave it in a different room.
Perhaps I just don't like knives as much as the rest of you, I don't feel the need to have one on my person at all times, especially when I don't need one, and there are several around if I do.