Just as the tittle says. Does some really horrible shit because they believe that it is for the good of EVERYBODY. His evil deeds are not for themselves but for everybody else. Whether if it is actually good for them is up to debate. Like a Litch turning everybody into an undead and killing those who disobey to save them from famine and resurrecting dead loved ones. Or it could be committing mass slaughter so that they will be prepared for an alien invasion. They are not anti heroes. They're the bad guys. They just believe that they're doing the good thing. Again, they will not benefit from their actions. If they did benefit, it was through some pure coincidence and utterly dumb luck. So no Nazis and the like.
The Executed Sage Reincarnates as a Lich and Begins a War of Aggression In the face of absolute evil, humanity will unite, thats the logic.
Mr. Villain’s Day Off. Very loose reference, cause his morals are as you say but he’s the type to not work overtime. So comedy
I'm the Evil Lord of an Intergalactic Empire the MC want to be the bad guys because he's tired being good guy,its funny.. Spoiler This is a misunderstanding novel, the MC believe he is the bad guys but people believe he is the good guy
Baito de Aku no Soshiki, maybe? Though you better read the manga since it's got more chapters translated than the novel's
That reminds me of a manga about a broke evil organisation. The narrator was a good guy hero who got into troubles because the blonde evil organisation executive gal was always after him, in a romantic sense. Forgot the name tho.