Not really. There are plenty of reason's for an obsession with duality, and really it takes a bigger stretch to reason that his father is the cause for duality than many other factors.
1. The scarring to begin with has a major impact on Harvey's persona, it splits his face, and it splits his mind.
I'd disagree. To a person who had no prior obsession with Duality, then the scarring could mean anything to them. Some might think that part of their face was ruined, and some might think they're whole face was hideous because of that one scar. Harvey only jumped right to the "two" part of it because he already had a preference towards that number.
2. Justice vs. Vengeance, something that begins to haunt Harvey before the scarring, how can he stop the violence, does he try to
I really don't buy the coin flipping as a seed for duality either, because there was no duality to it. Yes Harvey thought there was, but if he got beaten night after night, if he had it revealed that there never was a choice between the two, that completely deconstructs the very idea of duality within him.
I don't think it discounts the idea of duality within him. He was a child at the time, he probably didn't realize it was a two headed coin until it was much older, and by the time he realized that, his morbid attraction to duality had already begun to form in his mind.
The only thing that the abuse then establishes is Harvey's obsession with the coin, and the emotional scarring his father laid into him. If Harvey were to have the beatings fully imprinted within him, upon breaking he would choose violence every time.
I don't understand this part. "Upon breaking he would choose violence every time." That doesn't make sense. Just because he was beaten it does not mean that he would choose violence every time he flipped, and he only broke once, and that resulted in two-face.
Child abuse has led to the formation of multiple personalities however, that's been documented. So that again also fits Harvey's profile. Except in his case, his multiple personality hadn't fully formed because, as
StorminNorman said, by the time he's the DA, he had long since dealt with his inner demons, and had stomped out the seeds that would have let his multiple personality to flourish.
I don't buy it, and I see it as entirely unnecessary. It works on some levels but there is enough material to establish Harvey without it that it becomes kind of redundant.
I disagree, but I suppose it comes down to personal preference. I like the idea that he was abused as a child, otherwise it makes him seem kind of weak. I mean, yes, he had lots of horrible things happen to him before the Acid incident, but lots of real life D.A's have things like that happen to them in real life, and they don't crack and go nuts.
It makes me feel a little more for Harvey when I learn that, on top of all the crappy stuff that happens to him as a DA, he also had a crappy childhood.