The Meaning of Brah in Genesis 1

In Hebrew, these words are extremely harsh. The first word is used of war conquest and enslavement. The second word refers to ruling harshly over someone or oppression. So God is telling humans to make a warlike conquest on the earth because it needs subdued. Implying the earth wasn't perfect and humanity was elected to transform the earth into a better place. But to do that meant tackling the harsh environments forcefully. Also, humans seem to be given the right to kill animals implying death was already in existence.