Genesis 9:3-6~

Every moving animal that is alive may serve as food for you. Just as I gave you the green vegetation, I give them all to you. Only flesh with its life—its blood—you must not eat. Besides that, I will demand an accounting for your lifeblood. I will demand an accounting from every living creature; and from each man I will demand an accounting for the life of his brother. Anyone shedding man’s blood, by man will his own blood be shed, for in God’s image He made man.

What I learned:

Here God clearly differentiates between the value of a human life vs. animal life.
That God should ‘demand an accounting from living creatures’ means that an animal who shed human blood should be put to death.
Though it is not immoral to eat bloodless meat as a means to survive, it is immoral to take the life of another person.
The only exception to this is if the person who is being killed is in turn guilty of having killed someone innocent.
In such a case the execution of the person who has blood on their hands serves to vindicate the innocent party and thus some level of justice is attained.
However, though true Christians recognize the authority governments have to exercise their right to execute capital punishment, they do not get involved with the political matters behind these cases, as is instructed by Jesus in John 17:16.