@Doomer I mean this character didn't necessarily say it was "for the lols" either.
It seems if anything her seven deadly sin nature influenced her, maybe. "this world felt like it had to be destroyed" paired with saying she thus made it uninhabitable as a sort of compromise, makes it sound almost like some kind of obligation.
Maybe not, though, it doesn't really matter, maybe she wanted to destroy shit by her own volition, maybe being part of the deadly sins was thrust on her, either way I wouldn't be surprised if she gets adopted.