Is God a Lover or a Fighter?

In Psalm 18 God is presented as a warrior. But in many other psalms and in many other books in the bible the Lord is presented as a loving God. In many places in the bible God is shown as being patient and forgiving. But, if at any time you sin against God you are condemned and so too are your children. So is God a lover of all his creations, or is he a fighter and enforcer of his laws?
If the Lord loves all his creations and wants them to prosper then why would he condemn them? Why would he choose sides and help one of his children to destroy the other? In Psalm 18 it seems as if God has chosen a side. He is helping to destroy this other person and it seems as if he has declared war against his enemy. But how could his creation be his enemy? How could he love all yet destroy them? Many religions believe that there is favoritism, but this is contradictory to the teachings of the bible.
The majority of the books in the bible present evidence of God being more of a lover than a fighter. And although there is a lot of evidence of this there are still historical events that show God as more of a fighter than a lover. Now with the addition to the bible which is the New testament it gives people another way to be on God’s good side. In the past before the New testament it seems like God was more of a fighter but now with the hope of being saved in present day he is more of a lover.