Sampson in the Bible only stood up for what was right once - knowing it would kill him. Bruce Wayne's father stood up for his family - just once. What if he found a way to survive the incident and STILL help his son to realize his future as Batman?

My idea goes roughly as this.

What if Thomas Wayne knew the man in the alley was a hitman from the mob? He knows his time is up, so instead of fighting with his killer, he simply tells Bruce "Mommy and daddy love you. That man was paid to kill us. There's nothing you can do." This pauses the crook just for a moment and Thomas offers him millions of dollars to get a new identity and be safe from mob retribution.

He takes the offer, they go back to stately Wayne manor and he gets his money and leaves. Thomas keeps his word and gives him an hour before calling the cops. The incident leaves Bruce traumatized and wants to stop these criminals. Thomas, a wise man, realizes his son needs to do this and encourages him. When the bat comes into Bruce's study and he realizes his costumed mission, he tells his father (not unlike a gay man coming out to his parents). Expecting criticism, he gets affirmation. More so, his father helps him design and build the Batcave.

How much more emotionally stable would the Batman be under THIS scenario?

But being emotionally unbalanced and on-the-edge is a core feature of Batman's character. He's supposed to be a messed up dude who is angry and obsessed because of his tragedy, otherwise he kinda loses the reason to become a hero.

He wouldn't become batman if his parents lived even in the scenario you presented. Yes he would want to make the city better but not to the extent he becomes obsessed and start dressing like a bat to beat up criminals instead he would use his considerable weight has Bruce Wayne to fight for the city.

An emotionally stable Batman is not possible as it is emotional instability that drove him to become what he is .

Insanity depeneds of the society and cultural group you are member.

Batman is not insane since there is more people like him around, Green Arrow and others.

That why many self destructive patterns like drink alcohol, one night stands nad durg use are not being seen as insane, even when are self destructive behavior.

Also there i huge chance Bruce Wayne would had being Batman dont matter what.

Yeah, that could work. It would maybe make things a little different, but it could still be worth reading.

When the bat comes into Bruce's study and he realizes his costumed mission, he tells his father (not unlike a gay man coming out to his parents). Expecting criticism, he gets affirmation. More so, his father helps him design and build the Batcave.

This part kind of reminds me of Batwoman. When her dad found out she was doing vigilante crime-fighting, he was hesitant at first, but then sent her off for proper training with some of his military acquaintances, and he put together her headquarters, with equipment and costume.

Traumatic experiences affect each person differently. I think an eight year old nearly being killed in a back alley who wants to keep something like that from happening to anyone else could still go down the path of Batman. The idea would have to be fleshed out a bit more, but it's still a plausible superhero background.

There are a few problems with it like Bruce would learn that money could solve the problem and would turn out more financially driven than physically driven. In a way he'd turn out like Lex from Smallville. If he didn't he also likely wouldn't dedicate himself to as much study as he was able to after his parents' deaths which results in a very much less skilled Batman if he were to be created at all... I'd actually see something more akin to Batman Inc and Bruce Wayne's cover coming out of it at the start than 20 years into being Batman.

I'm not saying he wouldn't want to prevent something like that from happening again but he wouldn't as obsessed as he was and would most definitely not dress up in a costume to fight crime. Instead I believe he would the more sensible thing and attack the problem more from a financial angle just like his father before him

Hmmm, interesting

He'd be more sane

Probably he would see the evil his parents tried to stop and row to help them. I don't think his mom would let him go around the world to train though.