Even successful bosses need to be queried about the whys and wherefores of their actions.

即使是对成功的老板也要质询其决定的原因。

《柯林斯英汉双解大词典》

You are a man that has gone through it all, naturally you know the whys and wherefores of it.

你是过来人， 当然明白其中道理。

《新英汉大辞典》

We must always go into the whys and wherefores of anything. On no account should we follow anyone like sheep.

我们对任何事情都要问一个为什么， 绝对不应盲从任何人。

《新英汉大辞典》

And in moments of crisis, people like to back their leader, sort out the whys and wherefores later.

NPR: Mideast Conflict Has Ripple Effect in Washington

Afterwards we get a long diatribe about the whys and wherefores many "1080p" TVs don't accept a 1080p input.

ENGADGET: The (in)famous 1080p truth HD