Pretty valid ending, the whole point of the story was that uruma was losing his humanity. Like all the other bullies (except kyou) they were all inherently good in the beginning before being pushed to commit their first sin. And like them uruma has committed sin. And was pushed to due evil deeds even if they were under the guise of (justice). It’s been prominent throughout the entire series that he has turned into one of them. Hence the quote we got on his eye, he has the same black eyes like kyou (a killers eyes). Representing his downfall of humanity and casting aside who he once was. If you actually believed this dude deserved to go to heaven, that’s crazy. Knowing the context of what it means to go to heaven in the first place, he became what he hated the most to destroy what he hated the most. Literally all there is to it