I said in the context of "violent retribution" meaning, that there has been violent retribution by disgruntled people (mass shootings). So in the context of a country where we've seen shootings (violent retribution), Trump seems unaware how his statements could be interpreted by some crazy as a message to kill Hillary. 
Now, I know we cannot all be help accountable for what crazy people do. But, it certainly is easy to misinterpret his remarks as so many have done. Even if they are a wrong interpretation, there is enough substance in what he said to make such an interpretation likely. 
Trump knows this. He just gets on a jag with a bunch of screaming supporters and can't keep from making veiled threats. But then, he is praised for "speaking his mind". 
I see another poll showing another small drop in his numbers. Oh, but wait. The polls are wrong.  Fact checkers are biased. So is the media. And now, I bet the Secret Service that spoke to him about his speech.