The worst part is even though it was an accident if Haru hadn't met Ren his parents really...

With that way of thinking then we really should do anything or go anywhere because something that is unforeseen and unknown might happen. I disagree that if those two hadn't met Haru parents would have alive, yes it's a possibility same as its a possibility that they might have died at a later date, the entire family might have gotten killed or their plane could have crashed on their planned trip to Canada. Basically what i am saying their is no way we could say that if Ren and Haru hadn't met Haru parents would be alive, If Ren killed them himself then we can but since it was an accident, we can't

I don't think it's wrong to acknowledge that if something hadn't happened something else wouldn't have happened, it's when we try to give it more meaning than it deserves and become stuck on the moment that it becomes an issue.

I don't like what ifs, sure maybe the family would've died later most likely from old age, but that isn't what happened. That's just a possibility, and there are numerous possibilities that could've have happend but didn't.

What did happen is they died in a car crash. Any other possibility is irrelevant because that's what happened. Is this Ren's or Haru's fault, no, but they took part in the events leading to the parents death just like the other driver and Haru's parents did. It's not a negative thing unless Haru can't accept it and makes it one.

Base on your previous statement, aren't you putting more meaning on Haru and Ren encounter- there isn't a meaning greater then an encounter causing someone else's death. Your line of think (x cause y, if x didn't happen y would't happen) might work for you but personally i think its destructive, for example, lets say- someone said hi to you in the store and in attempt to be nice you talked to them, when you leave they follow you, they follow you in order to find out where you live. If this happened to you (by the way this actually happened to me) would you think its because you talked to that person or the person is mentally ill or at least unstably. With my way of thinking, i didn't think it was simply because i talk t him that caused him to follow me, i believe he was so mental unstable he placed more meaning into that simply meaningless interaction. If he didn't follow me i probable would have never even remember that interaction.

I'm only mentioning one factor, and yes if someone I don't know follows me I'm going to automatically assume they're following me for a reason that probably isn't nice and that maybe if I hadn't talked to them they wouldn't have fixated on me.

That isn't to say there aren't other factors leading to him following me, just that the factor I could control, me talking to him, may have had a part to play in him following me.

I'm not sure what you're point is. Yes if nothing happened I probably wouldn't remember the interaction, but even if something does happen it doesn't automatically mean I'm going to stop talking to people who say hi to me or accept blame for someone else's actions causing me harm. I cant' control what someone else does, but I can control what I do, I think thats what makes it easy for people to blame themselves in cases of tragic accidents. It's a very human thing to focus on what we did that played a part in something bad happening even if our part is just saying hi to the wrong person.