Are you American? Are you familiar with American history? Check out the Civil Rights movement of the 50's and 60's. When black people were chased down, beaten, had dogs sicked on them for wanting the rights they're entitled to under the Constitution. And the worst of all was the flagrant and outright murder of black people in the southern states, often with the consent or help of the local law enforcement. And the most iconic of these killing were the LYNCHINGS. Don't know what that means?
"Lynching is an extrajudicial execution carried out by a mob, often by hanging, but also by burning at the stake or shooting, in order to punish an alleged transgressor, or to intimidate, control, or otherwise manipulate a population of people, however large or small."
Do you understand now why the silhouette of a HANGED MAN might just be incredibly offensive to a good chunk of the American population, and could easily be taken out of context and turned into a media shit storm by people with a misguided agenda?