It could be a case of too little, too late. I don’t think Cruz’s endorsement would make any difference in the election at this point. As a former and ardent supporter of Cruz’s presidential candidacy, it’s my opinion that he did possibly irreperable harm to his credibility by his shameful behavior at the convention. Many of his former supporters haven’t forgiven him for that, and may never.
I’m with you. I don’t believe Cruz can rehabilitate himself now. No one can ever trust him again.
You can be sure that Cruz knows his endorsement now would do nothing to boost Trump’s numbers, which is why he might just do it now. In this way, he makes good on his campaign pledge to support the GOP nominee for President, but too late to make any difference.