It's just I very rarely hear people refer to just humans as a target of theft. Most of the time, it's "people" or "anyone" or whatever. It's not a big deal or anything, just a little strange to me.

You must be new around here. Don't worry, people ask that one all the time. But the things in the store are literally free. You take what you need, though if you think it belongs to someone else, you be respectful and leave it. As for why it's all free, that is much more complicated.