Right,I'm going to put something to you now Adam.
Say for instance you were driving along at night and you could see a cars headlights at a distance in your rear view mirror. All you notice is that it's a dark-coloured car,it overtakes you and in doing so,knocks over a pedestrian,who lands right in front of you hitting the bonnet/bumper of your car.
There are no witnesses,the speeding car is nowhere in sight and there's a dead pedestrian in front of you,a dent in your car where he was thrown,along with blood and a missing part of your car minus some of its paint.
How are you going to explain to the police that there was another car which was involved,yet the pedestrian has all the hallmarks of it being yourself who'd been involved,as your clock states 70mph in a 50mph area and no witnesses around,blood on the front of your car,and your brake-marks on the road.
Are the police going to believe your story ? No,they're not. They've heard it all before. Row with the girlfriend that night and not concentrating on the road as well as going too fast to brake. Probably under the influence of cannabis. They'll throw the book at you.
You're arrested and nobody will believe you. You'd had a previous run-in with the police for possession of cannabis. No witnesses. No alibis'. No chance !! Like it or not,a manslaughter charge would follow and there's damn all you could do about it.
It would matter not how many times you kept saying you didn't do it,,there's nobody out there listening.
Your word against the law. Who do you think wins ?
Don't ever think that you'll sail through life without a brush with the law over something,then you'll find out how fair the system is,because right now you've got a lot to learn.