Poor biff

the rape attempt was kind of a honey trap though. Just because Biff had the potential to do that doesn't mean he necessarily ever would have originaly. Remember the only reason he tried that was because this was Doc and Marty already interfering , originally Lorraine and George were awkwardly dancing at the dance. A person could say "I'd never take advantage of a drunk girl, or rob a store if I was broke" but if they're never in that position they really don't fully know.

Indeed, Biff made the choice to almost rape Lorraine. And in the alternative 1985, he had also made the choice to murder George and force Lorraine to marry him. It is clear that no matter what the circumstances around him were, the guy was always a complete scum.

Intelligence and purity.

The movie never mentions in the original time line that biff raped her. So unless evidence is produced I'm going to assume he didn't rape her.

Now that being said let's run through this.

Original timeline happens and biff is a bully he goes after George and his girl. He continues this into adulthood and that's pretty much it. George is weak and it's his choice to be weak! He could've moved away at some point or distanced himself from biff somehow. But they end up working together? He ever think of ratting biff out to his boss about him being harassed or doing his work? Nope. I realize that biff might have been his supervisor but still biff has to answer to someone.


So now Marty and doc go back into time they interfere with the timeline and everyone is out on different paths. Biff wouldn't have been in that car with her alone and tried to rape her if Marty didn't get hit by that car instead of George.


We hear throughout the trilogy about not messing with the timeline and about isn't the time machine for personal game. The entire 2nd movie is about that with the sports book. But that's exactly what they ended up doing they used it for personal gain. If after the second movie Marty and doc come back to the present time and things were actually worse because what they had done would they have left them alone? Hell no! They would've went back to fix it. When in actuality they should've went back in time to put things back into the original order that it was intended to be in.


But yeah because biff was a bully in high school and a dick to Marty's spineless stupid father let's punish biff.

Your entire theory of him trying to kill Marty. Again is because Marty got involved when he shouldn't have.

Also, don't believe that being a "typical bully" is harmless. My mother was bullied in the '50s. For example, some kids once tied a bag over her head until she hardly could breathe. And even to this day, she is deeply affected by what they did to her more than sixty years ago.

Biff was only showing us what many bullies become when they get older: full-fledged criminals. That was true also for one of my mother's bullies, who was involved in at least one burglary later on in his life.