Mostly because these are tragic deaths, where the individual was yanked out of this earth and was not allowed a natural death. This sign marks the very place where their journey in life was interrupted. The point where they crossed from light to shadow. The friends/family had this sign erected by the state as a private need to commemorate the actual place of loss. But also these signs are a public manifestation of life – a constant reminder for us – not to forget that the person commemorated, lived a life of significance.
” a man’s dying is more the survivor’s affair than his own”
– Thomas Mann