It's not"spooky" at all. Because it's a video game. A ridiculous videogame with time travel, magic and ghosts, immortal beings and every other clownery you can come up with at that. A video game where you can play as an undead. It's no surprise that an undead wouldn't care what happens to the world of living. I would absolutely support Sylvanas in game even if out of sheer curiosity and the novelty of it. WoW's story has run its course, there's nothing new for it to say, of fucking course I would support the reset.
Your own character killed more beings than all main characters combined. You have no problems with your character killing thousands upon thousands but can't deal when NPCs act similarly, appropriately to the setting? In a supposedly "role playing" game some people can't accept that people want to explore different, not completely tired paths.
Never before WoW have I seen such idiotic divide between a fanbase, that's been purposefully and artificially introduced by the creators themselves. Horde/Alliance divide is the worst thing about WoW, it ruins it.
It's like WoW players don't realize it's all fiction, it's like they live in WoW 24/7 and act like what happens in WoW affects their real life.