[mike-cardwell]

Is there also no difference between somebody entering your house without your permission to warn you about something, because they fear for your safety, and somebody entering your house to burgle it?

You should probably replace "harass" with "inform" in your comment. It would be more accurate, and less emotive.

[GHFigs]

Suppose you wake up tomorrow and discover that someone has left a note in an unfamiliar hand on the bed beside you. The note reads "You should put bars on the windows. Something bad might happen." It is not signed. You cursory search of your home reveals nothing obviously amiss. All the windows are shut and locked. You have no idea how someone could have gotten in.

Suppose you leave it be for the day. You've got more important things to do than blindly react to mysterious messages, haven't you? So day slips into night and before long it's morning again. You find another note:"Really wasn't kidding about the bars thing. I won't send another message after this -- it's up to you to take your security seriously." Same as before, nothing obviously missing, all windows and doors closed and locked. You have no idea who this is or why they are doing this. You have no idea if you can trust them.

How do you react?

[mike-cardwell]

Differently to how I would react if I was burgled.