What an AWFUL thing to tell someone that they're going to kill their child!!!
There are a lot of negative misconceptions about co-sleeping unfortunately, but with the right precautions I'm sure it's safe and definitely the right choice for you if you & your baby are happy that way. Instead of attacking mothers for their choices, helplines/authorities/media should be presenting unbiased information and advice on safe co-sleeping practices.
Sounds like you've been extremely careful and diligent in ensuring you are doing the best by your baby, so hope this hasn't knocked your confidence too much!