And that is what the whole dustup is about - not that Cruz tried to hide the loan, not that he tried to deceive anyone, just that they filled out a form incorrectly. And according to Trump, that is as bad as Hillary "mishandling" top secret information.
And since he's a big time lawyer, he knew better.
As others have already pointed out, just because someone is a Constitutional expert does not mean he is an expert in campaign finance disclosure laws. My sister is an expert in medical liability law - I would never go to her for advice on a criminal matter.
And do you realize that this loan that supposedly has him "owned" by Goldman-Sachs was a margin loan - which means Ted was basically taking a loan out on his own assets? Think of it like taking a loan out against your 401k. The money is actually yours, but because of the tax laws, it is better to get the loan than to take the money out directly. Now, you may not have known that, but I'm sure Trump did - and he still chooses to deceitfully misrepresent that whole issue for personal gain.
Just stop. You’re using logic and being rational.