Is it unclear that Jesus was not commanding his listeners in that passage? This was part of the story, the parable, of the nobleman. Those are the words of the nobleman, not Jesus.
You cannot just pick up the Bible and pretend to know all the meanings of any Aramaic/Greek/English text without some scholarship. However, you would think this was pretty clear as the punctuation quotes in current Bibles delineate who is speaking.
20 “Then another came, saying, ‘Master, here is your mina, which I have kept put away in a handkerchief. 21 For I feared you, because you are an austere man. You collect what you did not deposit, and reap what you did not sow.’ 22 And he said to him, ‘Out of your own mouth I will judge you, you wicked servant. You knew that I was an austere man, collecting what I did not deposit and reaping what I did not sow. 23 Why then did you not put my money in the bank, that at my coming I might have collected it with interest?’
24 “And he said to those who stood by, ‘Take the mina from him, and give it to him who has ten minas.’ 25 (But they said to him, ‘Master, he has ten minas.’) 26 ‘For I say to you, that to everyone who has will be given; and from him who does not have, even what he has will be taken away from him. 27 But bring here those enemies of mine, who did not want me to reign over them, and slay them before me.’”
Consider the point that Jesus is trying to make here-to use the language of the devotionally oriented here, ostensibly it seems that those who exercise spiritual austerity on earth will receive great spiritual gifts in heaven, and those who keep it to themselves will be punished-in any case, the "Master" is exercising judgements and doling out rewards and punishments. If the command to slay non-believers is that of a character in Jesus' story and not that of Jesus, then it is fair to ask who the "Master" in the story represents, and the answer is clear: he represents the Judge in the final judgement, the decision maker about the rewards of the Kingdom of Heaven, the son of man himself.
I'll agree with my accuser here: you can't just pick up the Bible and pretend to know all the meanings without some scholarship (which arguably is a fault of many modern churches in their attempts to reconcile their own existence with their biblical roots,) but you also can't make Jesus someone he wasn't in the context of the Bible just because it's uncomfortable or inconsistent with the picture the church has sold you ever since early Sunday School Classes and Davey and Goliath reruns. The Prince of Peace was apparently not very tolerant of people who wouldn't just fall into his program.