A non-Muslim white man in Wisconsin tried building a bomb, which killed him. He had white-supremacist material in his apartment. But officials and media don't want to "jump to the conclusion" that he was a would-be terrorist.

Indeed, that is not proven conclusively. He might have had some other motive for making a bomb, perhaps murder based on a grudge. But since we are not trying him for the crime, we need not demand proof beyond a reasonable doubt when considering plausible inferences.

The crucial point is to contrast this with what happens when a crime of violence might possibly be associated with some Muslim. There is little hesitation in those cases to jump to the conclusion and say "terrorism".