Is this good? The reason we care is because we want to be good; it should guide our thought and - by extension - our actions.

First, that depends on your perspective.

The common people do not care about the miseries or pleasures of ants - not that it is good, or bad, but it is simply inconsequential. In some perspectives, you may very well be these ants.

An action is good if it benefits you. It is great if it benefits those besides you.

An action is bad if it does not benefit you. It is terrible if you, as the receiver, would wish not to receive and if this is the case for those besides you.

These classifications - of good and bad - only apply to an period in time from a particular perpsective. Perspectives progress, as do times.

Thus, our second dimension is temporal. As actions accumulate, while each may be considered good or bad, they as a collective can also be judged.

It is important to not confuse this collective judgement of actions with an individual action, else you may be misguided into thinking good is bad and bad is good, and neither matter so.

Herein lies the importance of justification. You do not necessarily need an initial reason to do something (this is natural), but without reason that action may not stand in the perpsective of the future. You must build some framework of reason, else regret or forget.

Here arises a difficulty. To provide a reason, we must judge the benefit of an action apart from that of an instant. Such judgements require a scale to be chosen. Depending on the scale, the collective judgement may waver.

Just because you think that neither matter, does not mean it does not matter. While none may share your exact perspective, there are many who share a similar perspective.

Do no evil. is a Vagueness of these dimensions that could justify almost any action. This state is only resolved by a matter of chance that cannot be depended upon.