Yes, actually, it IS black and white

A halacha was being discussed, and the statement was made that "it's [not, or never, or hardly ever, or whatever] black and white. Wrong. The halacha tells us what to do, and we have to do it. We may not want to, but we know what we have to do. Usually, in life, what's right and wrong is pretty clear cut; the usual problem is the individual not being up to the task.

In this case, the situation being referred to was the rotzeach bishgaga (negligent murderer) not being allowed to leave the ir miklat (city of refuge) until the death of the kohein gadol, otherwise he risks being killed by the goel hadam (avenger). The mishna states that he may not leave even to save a life, not even to save klal yisrael. Now, there are two ways to understand this halacha--either it's assur for him to leave, or it's mutar but exposes him to risk. Now, if it's prohibited for him to leave, then it's most certainly black and white--the Torah tells us it's assur, so it's wrong. Even if we think we know better, that there are good reasons to leave, etc., it's still wrong. We look to the Torah for right and wrong, not to our own personal instincts. On the other hand, if it's not prohibited to leave the ir miklat, just really risky, well, the halacha is pretty clear cut there too--one is not obligated to risk one's life to save another, but it is considered a meritorious act. Not as black and white, but pretty close.

Again, we are never in a quandary about knowing what to do when we follow the Torah (of course, sometimes we're not certain what the halacha is, because there are differences of opinion, but that's a completely different type of case).