I've seen a few people say how what we got was a simple back story, so simple in fact that it could be summed up by "if I can't get slaves imana blow up this whole place" ... In fact someone on Ms wrote about first world problems and now everyone is copying him all over the internet :/
So let me share my 2 cents (very briefly because I'm on my phone):
As a kid he basically had everything and was happy, than he was uprooted from his world into poverty (on some grey terminal level misery), so his world crumbled, as a young child he went from being happy to hell and as a result of this hell his mother died,he probably blamed his father and thought that if he (father) was gone he (Dofy) would be happy again, as a kid he might have even expected to get his mother back, that he was expecting things to change back is further supported by the fact that he brought his father's head to Mariejoes, and they denied him that life just like his father, but unlike his father he couldn't just get back at them so he has been holding a grudge all this time ...
So let me share my 2 cents (very briefly because I'm on my phone):
As a kid he basically had everything and was happy, than he was uprooted from his world into poverty (on some grey terminal level misery), so his world crumbled, as a young child he went from being happy to hell and as a result of this hell his mother died,he probably blamed his father and thought that if he (father) was gone he (Dofy) would be happy again, as a kid he might have even expected to get his mother back, that he was expecting things to change back is further supported by the fact that he brought his father's head to Mariejoes, and they denied him that life just like his father, but unlike his father he couldn't just get back at them so he has been holding a grudge all this time ...