Mutated beasts usually had no concept of honor.
Honor was a civilized construct. It restrained the conduct of many beings and helped to maintain order in society.
Exobeasts arguably had rudimentary societies of their own. They all abided by a set of rules that ensured they did not hunt their own species to extinction.
That said, they could still be as cunning, cruel and dishonorable towards other species!
Traps, surprise attacks and more all served to increase their chances of survival and prevent themselves from sliding down the food chain.
The mutated beasts that had transcended their original species and evolved into unique existences no longer had to rely on these dirty methods to maintain their place at the top of their food chains.
