Rock and a Hard Place

"When, as will happen, you are yourself forced to choose between two bad things, then choose the lesser of the evils and choose it boldly. That will be the right choice and, if circumstances are truly as circumscribed as you believe them to be, that will be the right thing to do in that situation.

But it still won't be a good thing. It isn't a good thing and cannot be made good."

And yes, I know Fred partially borrowed the sentiment, but it's still a good one, for any set of ideals.