They created an exception, limited in scope, that applied solely to interrogations regarding immediately dangerous weapons where the officers have a reasonable belief that such a danger actually exists. The costs are limited and the risk of abuse is small where the scope of questioning is limited in such a manner.
Is this exception still in play for the Boston guy? How long has it been? It's an easy step to have a "reasonable belief that such a danger exists". Look what's happened with the Patriot Act and whatnot during our "war on terror".
I ask that because at this point this $#@!'s 5A right to "silence" cannot be violated. The actual text of the amendment reads: "nor shall [any person] be compelled in any criminal case to be a witness against himself." The right is at issue in a courtroom, not in the rest of the world.* If an interrogation takes a turn towards violating the 5A, LE hasn't "done the wrong thing" other than possibly jeopardize their chances of getting a conviction. IOW, the act of interrogating someone after failing to properly Mirandize them can really be harmful to themselves.
And, looking at it another way, carving out exceptions to the rule, especially one so narrow as this, doesn't give LE carte blanche to "do the wrong thing" since at the time of the interrogation the officers will not know for sure whether the risk they're taking will cause problems for the prosecutors. LEOs who are aware of the exception know that they are taking a chance, sometimes a very great one, by relying on it.
* Section 1983 actions have not generally been allowed for violations of Miranda.
I don't know if he has been mirandized yet or not but if not, it looks like the feds are just conceding that they'd rather interview him and aren't worried about the admissibility of his statements as some of the responses being reported (about religious motives, which brother was the leader, etc.) are outside the scope of the public safety exception.
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