Several facts you got wrong.
1 it was way more then NY, it was Texas booing him too as well as all the others.
Let's say you are right, that still does not answer my question --- if Trump meets the criteria Cruz outlined, why should it not be considered an indirect endorsement of Trump?
Why the boo?
2. The time for petty vindictive vetting is over. There is no end game possible where it matters other then to help Hilary.
Cruz was NOT being vindictive by appearing on stage, congratulating Trump and not saying anything bad about him. I see the speech as an exhortation to everyone ( Trump inclued ) not to forget conservative principles.
If (God forbid) Trump loses to Hillary, it will not be because of Cruz, it will be because of Trump himself.
3. Your saw what you wanted to see. People versed in Lawyer/politician games saw a self centered politician trying to set himself up to run for president in 2020 and trying to sabotage the nominee. He went way beyond his 7 min speech. Several People there tweeted he was off his speech. He was campaigning again and then tried to stick a knife in with a dog-whistle to people like you. Deny it all you want. The fact even his own delegates there saw it should wake you up.
Nope, what I saw is correct and these so called "well-versed" people are wrong.
The facts are:
1) Cruz's speech was submitted long before he appeared
2) Trump and the RNC approved and cleared the speech
3) Cruz graciously congratulated Trump
4) Cruz spoke about conservative principles
5) Cruz exhorted the Republicans to vote for these principles.
IF Trump truly met those Principles, the right response should be to say to yourself (if you are a Trump supporter ) "Yes, that's Donald Trump he is talking about."
That they booed him instead tells me what a large number of Republicans have become.
That the crowd would later applaud Paypal Co-funder Peter Thiel, who openly declared that he was gay ( why the heck do you have to tell the world what your bedroom preferences are? ) and whose company abandoned plans to open a facility in North Carolina because the governor signed a reasonable Transgender bathroom law, tells me EVEN MORE what the Republican Party has become. The boo's simply cemented my suspicion.