There are three kinds of Zora. You have the OoT Zora, or civilized Zora, the evil Zora( also known as the Zola) and you have the Zoran, Like Miukia( the guy in MM) you have special warrior abletes like being able to use thier arm fins as boomerangs. I hope that clears it all up.
Negotiations, ritual death match, same difference.
I think this could be an explaination for alttp...
The zolas in alttp aren't zoras but a mutated species that were turned evil by agnaham (i know that is spelle wrong) just like the gaurds.
But for other games where they are evil, i think it depends on the timeline theory you are looking at. I will use one that says that LoZ and LA are the last two games.
In LoZ, the zolas have been turned savage in order to survive.
It just a theory, I'm sorry if this thread somehow changes to timeline theory, but please post your thoughts...