What would you do if a homeless child came outside your house?

I figure if a stranger shows up at my front door then they ought to expect me to be careful.

Shit, whenever I get phone calls from private phone numbers I either don't answer, or I answer by saying, "who is this calling me from a private/blocked number". I honestly don't feel any obligation to be overly polite, or friendly when I see an unfamiliar phone number, and especially NOT a private, or blocked number.