User blog comment:Enda Kenny/The Civil Flame War : My Response/@comment-13446185-20130918003631/@comment-3524435-20130918204235

Just remember that the gods in the Elder Scrolls are not inherently good or evil, so committing a murder here or there isn't going to prevent you from achieving divinity. Just look at the Tribunal.

As for the slavery, Tiber Septim probably hated the fact that it was going on (his "evil" actions weren't done for pleasure, but for his vision of the greater good) but he needed to give Morrowind more freedoms than other provinces to get them to join his empire, and aid him in his campain to unite Tamriel.