It really is quite simple. If police officers ask you questions, you answer them. If they don't, you shut up. If they give you the opportunity to explain the situation, consider it a gift. If they don't or after hearing it they say the words "we're placing you under arrest", talky time is over. Put your hands behind your back, because you're either going to jail, going to the hospital and then jail or you're going in the ground.
That's the reality, that's exactly the way it should be and if you think it shouldn't be that way, then you're an idiot that thinks cops should be street judges who you plead your case to without the benefit of a lawyer...an idiot.