A few weeks ago I posted an article about warspying, many raising the point that this isn't happening in the wild. Here is an article about a neighbor that caught someone else down the street beating up her children with his wireless cam equipment, in this case it was for a good cause, but I hope this shows it isn't as uncommon as you think it is.
http://www.local6.com/news/2852367/detail.html
http://www.local6.com/news/2852367/detail.html