Marlene has never been stupid. She knows that this is a war that they deserve to win, but also that war victories aren’t decided by worthiness, but usually by who has the least to lose and less moral qualms. Unfortunately for the Order, that definitely classifies as the Death Eaters.

It’s not as if Marlene wants to be fighting for a lost cause—one, if it was a lost cause, she doesn’t think some of the Order would still be here, but two, she would fight even if it was—but she looks at it as this: everything is stacked up against them, except for the strength of their belief and the fact that they are right. It is not an impossible war; it is possible, simply challenging. However, that is no reason not to fight. In Marlene’s eyes, it’s more reason to fight: how can the odds ever be in their favour if there’s no-one to sway them towards them? It’s smart to know your odds and weaknesses, as well as your strengths and luck, because it helps you prepare for the coming onslaught much better.