For some people, literally anything is accepted to justify or excuse their murder, & offer a helping hand to their killer: a hoodie is suspicious, Skittles could have looked like a gun to the right-wing murderer.
For others, literally nothing is accepted to excuse their murder: e.g., profiting personally from a position of power & responsibility which the CEO used to intentionally cause his company's paying customers to die.
OK.
It's useful to have diagnostic tests.