He should have stood up for free speech! He should have mocked the protesters who were vile leftists. He didnt. Instead, he went into campaign mode and used the floor time to promote himself
Cruz said the responsibility for the actions of the protesters falls on the protesters.
What do you want, jump up and down, shake his fist and yell "effing communists!"?
That is just not the way he does things.
That sort of Trumper tantrum is probably patented or trademarked by now, anyway. Then Trump supporters would call him a thief over copyright infringement or something.