[infinite_spin]

> I'm half joking because the situation is quite bizarre and I never encountered anything like that.

half joking is still joking, and this is not a "quite bizarre" situation, in fact it's rather common for people to make threats. It's "quite bizarre" to me that you don't realize this.

> Not to mention the owner could just ban a person thatch bad for business. Or just install a camera, since police demands a proof.

I think I mentioned, the owners did in fact trespass this person. Aside from that, the cameras don't have audio.

I think I need to end this conversation, because it's going off track into my personal life more than I'd like, and I don't think your investigative (or joking) tone is appropriate. My example stands, from my perspective, as a valid reason to want this technology.