That has nothing to do with the defense’s argument in the case, this is a pretty weird framing of it. The defense is arguing there was no attempted murder, no lethal force, that rather than assault it was self defense, and that the prosecution witnesses were lying and contradicted by the video footage. The case isn’t about whether “honor killing” is legal in the US, it isn’t, there would be no contest if that was the case the defendants were trying to make