Well, as I see it the question of bravery or cowardice is the wrong question to ask.
How can it be the wrong question if that's the question SRD wrote?
Sure, we are all entitled to our own interpretations of this text. And SRD has himself admitted that he regretted some of his choices. But in this instance, I think that if you believe it's the wrong question, then this exhibits a misreading than rather than a mistake on Donaldson's end.
I think it is the perfect question for the reasons I outlined. Isn't personal responsibility an issue of ethics? Isn't the issue of denial vs acceptance an issue of ethics--especially when we're talking about deny/accepting our own Despiser? Think about alcoholics; the first step is admitting that there is a problem, a danger, and THEN fighting the battle to overcome it. Is that not an issue of ethics? Isn't it cowardly to deny something that is unpleasant? Isn't it brave to face something unpleasant about yourself head-on?
I know I keep repeating this, but it can't be said enough: Donaldson is dealing with existential authenticity. I mean this in a very specific, technical way, as used by existential philosophers (Heidegger, for instance). We are unique among all life on earth because we can choose whether or not to be true to ourselves (wasn't this the main bit of advice the Creator gave Covenant: "be true"? He meant: "be true to yourself"). A cow can't help but be a cow; it can't help but to be what it is. However, humans must first "wake up" to themselves, face themselves, know themselves, in order to be true to themselves. Most of us spend most of our time sleep walking through life, not really aware of our existence as such, our existence as being-in-the-world. We usually don't consciously will our existence, don't consciously put ourselves into the world by acting willfully and knowingly. Usually, this is due to laziness, ignorance, or complacency. But sometimes it is due to fear and an inability to face our lives as they really are. When this is the case, YES, it is an unethical, cowardly choice.
Some of the things we don't have the courage to face are mortality, finitude, the responsibility of choice, our potential for despite, our guilt over the past, our power over the future, etc. These things are terrifying, so we don't face them. They are terrifying to Covenant, so he spends the first book fleeing from them [literally--this is his story for most of LFB and beyond]. But no matter how terrifying they are, they are part of the fundamental fabric of what it means to be human.
When you do not have the courage to face that which makes up the fundamental, existential fabric of what it means to be human, you are committing a violation on the highest level of ethics--you are diminishing your humanity. In existential terms, inauthenticity is the greatest "evil." It is through giving up or denying one's own humanity that evil acts are possible in the first place.
And if we understand "inauthenticity" in terms of not having the courage to face yourself as you actually are, then Donaldson's question is perfectly worded, and perfectly relevant. Afterall, Covenant thinks all his denials in LFB are acts of bravery, a way to preserve his sanity; but it is actually cowardice that drives him: he's scared to let himself be human.
I think SRD knew what he was talking about.