Your assumptions are not convincing, if you read the verse itself, which refers to 'the Lord thy God'..
I am not trying to convince of anything, really, but simply to have a healthy discussion on the Law and how Jesus treated it - and what inspiration means.
I'm not averse to the idea that the OT commandments were all of God's commandments, but I am then wondering about where the particularly violent commandments fit in.
For example, in the verse you stated, Jesus is quoting from Deut 6. Perhaps this is a commandment directly from God. But is this from Deut 20 directly from God as well?
"10 When you march up to attack a city, make its people an offer of peace. 11 If they accept and open their gates, all the people in it shall be subject to forced labor and shall work for you. 12 If they refuse to make peace and they engage you in battle, lay siege to that city. 13 When the Lord your God delivers it into your hand, put to the sword all the men in it. 14 As for the women, the children, the livestock and everything else in the city, you may take these as plunder for yourselves. And you may use the plunder the Lord your God gives you from your enemies. 15 This is how you are to treat all the cities that are at a distance from you and do not belong to the nations nearby.
16 However, in the cities of the nations the Lord your God is giving you as an inheritance, do not leave alive anything that breathes."