The following comment is inspired by Matthew 5:21. I respect both groups of people who eat meats,and the group who choses to be a vegetarian. In both groups what is eaten had to be killed,wheather the slaughering of animals,or
the picking the fruits and vegetables from the ground or tree. In both cases life had stop. Jesus is not talking about the killing of these life sources,but human life. Notice the way Jesus is speaking," Whosoever shall kill will be in danger of the judgement."
Meaning we not given permission to just go and kill people just because we don't like them,or because we have the will or means to do so. But, there is a time when killing is justified,as stated in Ecclesiastes 3:1-8.