Did you ever have a cross of ashes on your forehead on Ash Wednesday? https://www.nationalgeographic.com/history/article/meaning-cross-ashes-ash-wednesday
It's a matter of context. If you don't know or understand the tradition it might appear alarming. If you do? Then you can either say yes or no. But either way you know the 'why' so for the vast majority of people there's no pressing reason to be particularly upset about the offer (special exceptions, as always exempted).
I wonder if the method of execution had been the electric chair, if the outline of an electric chair would be drawn out on the forehead?