Say the police saw you throwing water/coke/coffee out of your window, they would stop you for littering I guess. How does this change if the fluid is diesel?
How serious is this threadHow serious is this?
should I even think about reporting this?
Well, if someone gets killed. He could end up in prison for manslaughter.
Surely doing it intentionally to make people have an accident, as the op mentions it could be argued as murder based on premeditation.