How selfish it is to consider the life-altering experiences of others "propaganda" - selfish or just scared, but I'm no less amazed at their need to announce their lack of empathy to the world. I'd keep it quiet. Empathy isn't a favor you do for someone else; the loss is yours in not having what seems foreign to those of us who aren't threatened by a particular grief that we haven't shared or envious of the courage to express it.
To have empathy for the victims of gun violence is not a political agenda nor is it sympathy, and I doubt any of these people need or would accept the sympathy that fails to see solutions only limitations in a debatable issue. Nobody wants to take your guns away. Get over it. Maybe we can agree on the idea of America school kids mowed down by machine guns in American classrooms as disgusting. Nobody really cares about changing minds that need to see it as something else.