why vs why is it that

Some examples from the web:

• I understand why you're so angry, Haley.
• But why? - To be myself again.
• But any child understands why we need borders.
• I wondered why you left me alone...
• Remember the five-year-old completely understood why Ivan took Joshua's sandwich.
• Theoretical physicists always ask "why" questions.
• Eichmann, probably wondering why your presence is required.
• I understand why you stopped believing.
• I see why employers are reluctant to hire ex-cons.
• Which explains why Samuel Henderson down in that bunker.
• Wonder why he just shot once.
• Now explain why you chose that size endotracheal tube.
• And why that accident report was faked.
• However, they cannot explain why.
• The Korean guy asked her why.
• And why these people took my daughter.
• Perhaps a little self-reflection might illuminate why.
• See why Deborah called five times yesterday.
• I'm curious why you requested this parley.
• I could never understand why Rathe wanted Waxflatter to stay.

Some examples from the web:

• People ask me, why is it that a kid growing up in rural Australia got interested in learning Chinese? Well, there are two reasons for that.
• Finally, why is it that the Council as an appropriate body cannot work together in exchanging best practices?
• Then why is it that they seem to have something different?
• Now, why is it that justice only works in somebody else's favor?
• Tell me, why is it that your investors are so interested in land in South America?
• So, why is it that you haven't made one call to the east coast in the past three years?
• Commissioner, why is it that only spending on pensions can be given special treatment in your assessment of Member States' medium-term budget objectives?
• It may be that his letter does not answer every question, but why is it that we are first looking to pass a resolution rather than seeking dialogue?
• So why is it that you have chosen to see me at this juncture?
• In view of this, we must ask ourselves: why is it that, faced with the worsening economic situation, we are not at least using the funds provided in the multiannual financial framework?
• And why is it that Lord Eddard is sending Lannister men in place of his own?
• And why is it that Vernon Ephesian is reported by you a paranoid sociopath because he believes he lived 100 years ago, and you're not, even though you believe you died in that field?
• And why is it that the Wright brothers were able to figure out controlled, powered man flight when there were certainly other teams who were better qualified, better funded...
• Well, like why is it that I barely know her, but I already love her?
• I was wondering why is it that all the interesting guys are always married.
• But why is it that entrepreneurship is important?
• So, a huge issue has been why is it that this gradient exists.
• So why is it that this reform is so problematic?
• So why is it that women get stronger as distances get longer?
• Then why is it that your brain is so small?