I didn't mean to imply that the Proka family was physically abusive towards Rugal or that they didn't love him. They weren't, and they did. But I also think it's very likely that they purposely imbued Rugal with prejudice against his own race. Not to stick it to Rugal himself, but to the entire Cardassian people. Raising a Cardassian child to hate the Cardassian race could be seen as the ultimate form of revenge for a Bajoran family.
That being said, given the choice of the actor to play Kotan Pa'Dar...
These are the Prokas.
These are the Pa'Dars.
This is Captain Sisko.
And this is...SOAP.