Because if you cannot attack the message, attack the messenger..
Your Welcome.
YOU’RE the ‘messenger’, Goldstein is the ‘author’ and based on his own description of his background, I reiterate:
He doesn’t know WTF he’s talking about.
Now go consult with your fellow Trump-haters, you obviously need some pointers on how to smear the guy. This attempt was just another “FAIL”.
“You’re welcome”
You’ll find that attacking the messenger is standard operating procedure for folks who cannot refute the message.
Which is exactly what Trump is doing. He knows he doesn’t have much room to attack Cruz policy-wise, or he’ll alienate his own support. So he has to attack Cruz on something more personal.