Ragnarok: The animation.

It had loose morals in which the heroes did the most damage.

The male lead stabs a Munak in the back who was pleading with the female lead to help save her and her people.

The heroes venture into a friendly ant colony that welcomed them until one of the heroes goes mad and starts setting shit on fire. End result, they had to slaughter an innocent ant race of hundreds who were only trying to defend themselves.

The female merchant hacked up her own best friend with an axe because she mistook her for a monster.

The anime doesn't even breed an atmosphere as something that is dark and twisted, which makes it even more disturbing.