Is it just Golarion - the Worldeater's Cage - where Evil is advantaged over Good, or is all of Creation like this?
It does seem like Creation chews through its virtuous gods much faster than the evil ones.
Both Acavna died trying to save life on Golarion from Starfall, and then Amazen died saving life on Golarion from Starfall, and then Tsukiyo was murdered, and then Ibdurengian was slain by Aroden, and Typhon by Ragathiel, and then Arazni died saving life on Golarion from Tar-Baphon, and then Aroden was murdered.
She won't count Arazni, because then she'd have to count eight billion demon lords who mostly killed each other without it managing to improve the world very much at all. And if Kroft doesn't count Arazni, she doesn't have to count Ibdurengian; that's how it works.
So that's four heroic and noble gods, and in trade: Typhon. Worth it?
And those are the ones she's heard of from the last few hundred years. It doesn't seem like things were any better in the Age of Creation, though, when Dou-Bral became Zon-Kuthon, after arbiter Achaekek went bad, after Curchanus was murdered by Lamashtu, after Ihys was murdered by Asmodeus.
Near the beginning of all things, the strongest Lawful Evil gods were Asmodeus and Zon-Kuthon, and the strongest CE gods were Rovagug and Lamashtu. Whereas the preeminent LG, LN, and CG gods are a constantly rotating cast of characters. Is Evil, uninhibited, inherently stronger than good? Or did it win an early lead which it was able to build on? Or perhaps it's just that a handful of Evil deities - maybe Rovagug and Asmodeus - are very good at what they do, and everything else is downstream of that?