Absolutely you could have waited for a lawyer. You voluntarily decided not to. "voluntary" - done, given, or acting of one's own free will. You said yourself t

Absolutely you could have waited for a lawyer. You voluntarily decided not to. "voluntary" - done, given, or acting of one's own free will. You said yourself that you could have waited, but decided not to. Alternatively you could have just done a "no comment" interview, which - let's be honest - is what the lawyer would have advised you to do, no matter if you're guilty or not.