In this particular case the person in question was not read his Miranda rights not due to careless omission, but rather as a planned implementation of a little known provision known as the "public safety exception" which allows for law enforcement to question a suspect without a lawyer present and still be able to use information obtained from such interrogations as admissible evidence in a court of law.
The FBI's interpretation is as follows:
"According to the Supreme Court, the public safety exception is triggered when police officers have an objectively reasonable need to protect the police or the public from immediate danger. Because the standard is objective, the availability of the exception does not depend on subjective motivation of the officers. Legitimate concerns for officer safety or public safety prompting unwarned custodial questioning arise in a variety of contexts."
Now, as you are aware I espouse conservative views. There is nobody more willing to go out and punish the bad guys than me. This situation, however, does worry me. The same way that the Patriot Act worried me right after 9/11.
It is not out of a personal concern for this individual. I hope that he literally fries in the electric chair and then continues frying throughout eternity in hell for what he has done, but if we allow government to so easily bend the established law enforcement procedures that we have come to expect as part of the diligence of due process then we are inviting trouble further down the road.
I may have strong issues with how some piece of garbage like this can become a citizen; I may even have strong opinions on how this exemplifies the need for strict immigration guidelines, but he is a citizen now nonetheless. Therefore, if he were to so easily be labeled an enemy combatant, just by a wave of the hand of government, then any US citizen could in theory be labeled an enemy combatant and denied all Constitutional protection. That should worry everyone.
Who can say that at some point in the future government cannot label a particular domestic group or individual as a potential threat to public safety simply based on a hunch; or even worse, due to opposing or contradictory views with the government at that time. That is my fear in all of this. Allowing the emotion of the moment to set a precedence for the eventual erosion of liberty.