This isn't called obsession, its called sacrifice, he is willing to put he's happyness behind for the sake of helping people, you said it yourself, the mission is more important to him than anything and the mission is helping others. He was given a chance to be with his parents but he rejected the offer, that's called sacrifice not obsession. Dick would've gone after Zucco to kill him, many stories show that, Bruce saved him from that, and if he wasn't a murderer then he would've been a talon. And Dick would've been in circus if he wasn't with Bruce so no he wouldn't have been a hero, and Bruce doesn't like to help people? That's the biggest bs I've heard anyone say. You are the one who doesn't understand Batman, getting over something is something different, a person who can't get over something can also help others, everyone has something feel bad for, that doesn't stop them from helping others, if Bruce's parents weren't dead then he wouldn't have stopped helping others.
I like how I never said Batman doesn't like helping people, but apparently you think I did. Only that it isn't his main motivating factor. Okay, I'll try and explain it one more time so you can try and understand it and then I am finished.
Fighting crime is an obsession for Bruce. Make a thread and ask and I am sure most posters will agree that it is. It goes beyond just wanting to help people for him. He is the guy that secretly plans the downfall of his close friends and teammates "just in case". This isn't something Superman does or "normal" heroes do. He isn't some perfect noble hero but an obsessed, neurotic vigilante that will go to whatever lengths to make sure his Justice is carried out. Bruce can never stop being Batman. In Synder's story set 200 years in the future Bruce clones himself over and over again to continue to be Batman forever because he can't let go of being a hero. If Clark lost his powers I think he would be fine with being "normal" and just being a journalist, but Bruce couldn't just be Bruce Wayne. Like in the DCAU when he couldn't be Batman anymore he basically died inside and shut himself in his mansion for years.
The reason I said that Dick could have been a hero regardless if his parents died is that isn't the reason why he continues to be a hero. It doesn't matter to him if they died or not. If another opportunity to be a hero came up for him and his parents were still alive he would have been the same type of hero he would have been if they had died. Them dying is what lead him to Bruce and he helped him hone his abilities and train him. Like in the AU Flashpoint story he was still at the circus, but he became the new Doctor Fate when he needed to be and became a hero that way without Bruce. When Bruce's parents died he forever changed (some say when that happened Bruce Wayne actually died and Batman was born), but with Dick he is still the same as before his parents died. The New 52 Talon stuff is a newly added story and Dick would have become a Talon against his will once the toxins in his tooth activated. So that isn't really part of his personality or the type of person or hero he is and became.