In another Bible Study it was emphasized the importance motive plays in all of this. The first motive is to do and accept the will of God. God does kill people. But, as the author of life it is his right. He is not a murderer for murder is the unjust taking of life.
Death comes to all people justly as the consequence of sin.
When we make a decision at the end of life we are not deciding who lives and dies. God does that. Christians recognize that they are stewards of resources and lives. As such they will make decisions not as the owners of money and lives but as stewards of God. They will make decisions that reflect God's will.