The movie "Silence of the Lambs" was also the first thing that came into my mind when I heard of "Silentlambs". But I wouldn't personally criticize Bill's choosing that particular name. Imo it is just not something that needs to be an issue.
I do think that at this point in time though that a name change might be something beneficial to consider. Victims certainly are no longer "silent" and often they are not just "lambs". They have been empowered and are strong and have spoken out. At this point in time, the present name doesn't reflect the progress of the movement and can almost be perceived as a bit demeaning to survivors of this crime.
A name change also could signify a fresh start with a renewed focus. If the disorder of the past weeks has resulted in positive changes to prevent self-defeating mistakes a name change could reflect these positive changes. It would also place the focus back on the issue where it belongs and not on the person of Bill Bowen who seemed to be too synonymous with the name Silentlambs.
Just a suggestion for what its worth.
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