It is a really tough one. Every time I hear a child crying I want to call 911 but in the same breath, I sit there and think is it just a tired child/tantrum I am hearing or is something really wrong? I mean you also do not want to interfere in someone's life. People argue. Children cry. How does one know? I try to err on the side of caution but it is still a really difficult decision. I am sure any neighbor who heard this already beats themselves up over it. The perp, however, needs to be caught and rot in a cell for his lifetime. Jmo.