Besides, this comic is just a bad copy of the logic used by The Last Ringbearer.
It is unfortunate that Sauron barely has a motivation beyond "fuck everything", though. I was always curious of what exactly he intended to do if he won. Like, just being dictator is kind of a bland goal for a supernatural being. As is, I just sort of settled on the assumption that the Ring made him crazy in the same way as everyone else.
Morgoth was the one who was "fuck everything". He was envious of Eru's power as the ultimate creator and too proud to accept his role as just a participant in his song of creation, so he sought to disrupt the music to make it as much his own as possible. This resulted in Morgoth basically giving up the power to contribute his own unique creations to the world, instead messing with everyone else's in his attempts to make creation his own or destroy what he couldn't. Following creation, Morgoth's envy led to him stealing the Silmarillions, and that was basically the starting point of Middle Earth history.
Sauron was Morgoth's right-hand man, and extremely faithful to him. After Morgoth was defeated and imprisoned, Sauron basically laid low as a fugitive from the Valar and all their mortal allies for hundreds of years. Eventually, they all let their guard down, and he snuck back into Morgoth's old lair to start building it back up again. The ring's ultimate purpose was a fail-safe. As long as the ring wasn't destroyed, Sauron couldn't be either. It didn't really make him more powerful or drive him crazy, because its power came from being imbued with his own essence. He essentially weakened himself to create it and was incomplete without it. What power it did give him was the influence he extended through it to the bearers of the other rings. In typical Tolkien fashion, this is basically a lesser version of the same thing Morgoth did. Morgoth imbued his will into all of Arda, so that everything would gradually, unavoidably bend towards his interests over time. But in the process, he gave up his immortality and his ability to change forms.
I imagine his motivations were a combination of continuing loyalty to Morgoth (acting in his place until he returns? spite and vengeance in his name?), and rising to power being the only way for him to live freely after making himself a divine criminal.