Providing factual information is not encouraging suicide. Accepting that a person has made a decision to ctb, and doing what you can to support that person in the meantime, is not encouraging suicide. Suggesting that a potentially suicidal person slow down a bit and consider other options, when you consider that they may be prone to acting a bit rashly, is not encouraging suicide. Making a post on some subject other than suicide itself (e.g. about depression, or site administration, or introducing yourself, or philosophical musings about the pointlessness of life, etc.) is not encouraging suicide. I think all the posts I have seen on this site fall into one of those four categories.
I think the pro-lifers or at least some of them, confuse an acceptance of suicide by people here to be "encouraging suicide". That is just silly. (I accept that it snows in winter, but I certanly don't encourage it to do so.)