I appreciate that I can only truly comment based upon my own experience and that of those I have met through the support groups I am in contact with, but, (with that in mind), I would find the silent vigil/ prayers outside the clinic as traumatic as any other form of protest. As previously mentioned, I do believe in God and see myself as Christian, but my situation led to me questioning God, and feeling anger, resentment even toward a so called loving God who would allow me, my baby and my family to suffer. Having well meaning souls praying for me and my child, well, all I can say, (politely), is I would have found it distressing and inappropriate in the extreme. Even a year on, the idea is pretty unpalatable to me.
Of course people can protest, but if they wish to be seen as doing so in a compassionate manner, they need to choose their venue with compassion. Why not a prayer vigil in a local park? Why must it be in the clinic grounds? If they choose not to, then they choose to leave themselves open to accusation of a lack of compassion, and must expect to receive opposition, even if some of it is extreme.