There's a power in this combination of curiosity and definition of purpose.  As you'll see from this article, asking "Why?" can at once be both empowering and challenging.  That doesn't mean you shouldn't do it.

It's clearly a potential trigger for emotion, whether you're a parent, a CEO, a manager or someone just trying their best to get the job done.  But it never harms to keep questioning the intent and objective behind what you or those around you are doing.

However, don't be surprised if every now and then you get the response "Because I said so!".  That can often tell you more than you need to know.