the other part of this is that it's misunderstanding who God is and what creation is.
God created life, and therefore has the right to take it away. and the fact that we've sinned against Him forces Him to act within His own Nature to Judge according to His own righteous Holiness.
People want to continually think of God as some kind of nice benevolent being that only does "nice" things, forgetting all the while that He's absolutely HOLY and judges perfectly and justly.
and when we think of the responsibility and place in creation we have--so that for the very first sin against Him, this whole universe is fallen and "groans" (Romans 8:22)--we see how grevious sin is to Him and how serious it is.