Greetings from Planet Earth.
The so-called "Miranda Warnings" are not a part of the U.S. Constitution, and are not required by same. There was no rational purpose or legal justification for reading this accused person his "Miranda rights."
The "Miranda" warnings merely reflect the position of the United States Supreme Court on the usability of evidence adduced from interrogation of defendants who might not have been aware of their various rights (specifically, to legal counsel, and to remain silent). The concern, when it rationally exists, is that the suspect might reveal incriminating evidence THAT WILL BE EXCLUDED AT TRIAL, THUS THWARTING THE CONVICTION if those rights are not explained to the suspect.
But that wasn't a concern here. They already had a mountain of incriminating evidence so there was no danger of jeopardizing his conviction.
I repeat, it is not a civil rights violation, per se, to refrain from reading someone their Miranda Rights. The only downside is the possible exclusion of evidence at trial.
But in point of fact, the purpose of THIS extended interrogation here was NOT to ascertain (or reinforce) the guilt of the suspect, but rather to determine whether there might have been others who were culpable in the attack, or whether there might be continuing danger of future attacks.
It was a collosal blunder to "read him his rights," and the result was that a formerly cooperative witness was essentially discouraged from speaking further.
Reading of rights has become nothing more than a ritual, made mandatory only by universal stupidity and not by any principle of Constitutional law. Law Enforcement has an obligation to weigh, in each case, whether it is better to read the rights and silence an otherwise cooperating and informative suspect, or to refrain from doing so and possibly gain additional information. Again, the only downside of NOT reading him his rights is that some evidence may be excluded at trial - not a concern here. In this case, the stupidity of the interrogating authorities has likely resulted in the loss of significant intelligence that could conceivably have saved many, many innocent lives.
Let's hear a large Bronx Cheer for the Po-Leeeese.
Brazzzzzzzzzzzzzzzzzzzzzzzz!