From what I know, he was a staunch Ukrainian nationalist. For the Ukrainians, yes, he's a hero. But, for the Poles... he worked actively for the dismantling of the Second Polish Republic, he engaged in separatist agitation - all of this despite the fact that he was from an old Polish noble family, a nephew of Aleksander Fredro and that his brother was a general in the Polish Army.
But the worst happened in WW2, when he "condemned violence". Yes, that's it. He refused to condemn "OUN's violence". He just condemned violence. In a letter to the Polish Roman Catholic Archbishop of Lwow, who asked him to sign a joint declaration condemning the OUN violence, Szeptycki refused, claiming that this would leave him with no credibility. While I don't deny the fact that he didn't endorse the massacres, he did very little to stop them. He was the most important Ukrainian figure during WW2. But he kept quiet. Why?
I understand why Ukraine has statues of him. But in Krakow? Seriously.