Yes, there are some hard stories in the Bible to read and see that our loving God can also destroy the world in a flood, swallow up people in the earth who were disobedient and rage war on enemy nations.
But we also have to remember that it is His earth, His creation, His rules to follow and He can do with it as He sees best. Most of those stories in the Bible are about the evil on the earth and those who reject Him as their God.
Sadly, many of those stories are also about people who forgot that God is God and that we are to worship Him only.
Actually, Jesus gave us the greatest commandment that we can obery. It is our greatest purpose to love Him and then others as yourself.
God loved the world so much that He gave His Son, Jesus, to pay for the sins of the world.
Jesus loved the world so much that He willinging gave His life for us so that we could live with Him and have eternal life.
While on this earth, your purpose is to love like He loves.