Why are anti tank items so good.

There is no situation where black cleaver, or void staff are bad buys. Even when the enemy team has no resistances built these items are still some of the best to buy. Why? Why are items that are suppose to be made to push through the tankiest of champions allowed to be so strong that they are core items? Just about EVERY bruiser wants a black cleaver. Every ap build has a void staff either second or third.
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