I like alignment

[hamishspence]

...

What on earth are you going on about?

"Completely consistent" means exactly that. A person is not necessarily 100% of one alignment, but it is the majority that matters, not any individual aspect. Even if an elf treats human lives as disposable and with cruelty, they can still be Good, if the rest of their personality fulfills the criteria for Good.

I consider deeds more important than "the rest of the personality"

A person who consistantly does evil deeds against a particular group, is Evil, even if the majority of their deeds, since they rarely encounter that particular group, are Good.
And even if they're not completely consistant about that group- the fact that they're consistantly doing evil deeds at all, outweighs any Good deeds.

Inconsistently doing evil deeds, in time of crisis- that's reasonable for Neutral and Good- they can be "driven to Evil from time to time".