At a contentious news conference on Tuesday, Donald Trump was asked by a reporter why he felt the need to "antagonize" a federal judge who had ruled against him in a case involving Trump University.

"Why antagonize?" Trump asked rhetorically. "Because I don't care."

Those six words are Trump at his most honest -- and most revealing.  If you needed two sentences to sum up not only Trump's remarkably successful 2016 presidential bid but also the dominant strain of his life, those six words are about as good as you can get.

Time and again during this race (and in his life), Trump has picked a fight that not only he didn't need to, but also actively worked against his broader goals.

The most recent example was during his trip to New Mexico last week, during which Trump said Gov. Susana Martinez, the head of the Republican Governors Association, was "not doing her job." That hit came within days -- and maybe even hours -- of Trump's campaign promising to unite the GOP behind him.

Why did he do it?  Martinez's comments about Trump to an RGA crowd in April likely played a role. But, that doesn't explain Trump's broader tendencies in the 2016 race to attack candidates -- Jeb Bush, Rand Paul and many others -- long after they dropped out of the primary fight. Here's a reenactment:

The real answer to the "why" of all of this is two-fold:

  1. Trump is a needler by nature.
  2. Because he can.

For Trump, antagonism is second nature; it's how he engages with the world. Hit them before they hit you. Set the rules of combat first -- and be willing to break them if necessary. He views life -- and politics -- as a constant battle for respectability, authority, power and influence. That worldview is where "Little Marco," "low energy Jeb," "sleaze" reporters and a slew of other "very bad" and "dishonest" people comes from. You are either for or against Trump: There is no in between.

So, when a judge rules against him in a court case, the judge is bad and very corrupt.  When a reporter writes a story Trump doesn't like or asks a question Trump doesn't approve of, the reporter is "very dishonest." When one of his rivals raises questions about his policies, that rival is a joke or a loser (or both).

Trump's life is a string of examples in which he has not only gotten away with this behavior, but seen it rewarded. He built his father's real estate company into a far larger and more profitable operation. He became a national and -- gulp -- international celebrity. He ran for president on a whim and wound up as the Republican presidential nominee.

He says and does what he wants because he can. Because it has always worked. And because, as he said Tuesday, he just "doesn't care."

That sentiment is evidence of the often-overlooked aspirational quality to Trump's appeal for many voters. Trump is selling his version of the American Dream: Vote for me, be like me. While that idea prompts lots of eye-rolls in official Washington, it occasions lots of head-nodding at Trump rallies. Why? Because Trump is wealthy, married to a former model and can/does tell everyone what's on his mind at all times without any fear of retribution.

"He just doesn't care!," is something you hear often when you ask people why they like Trump. "He tells it like it is!" "He isn't politically correct!"

Trump's natural tendency toward antagonism and his "don't care" attitude would normally put him outside the political mainstream, dismissed as a loud-talking bully who doesn't grasp the gravity of the office he is seeking. In this election, where voters -- especially on the Republican side -- are willing to vote for anyone who can channel the rage and alienation they feel toward Washington, politicians and large institutions more generally, Trump has prospered.

Remarkable.