That's so true. In the end, our anger and hatred towards others is utterly meaningless. Before I was ready to go (a few months ago), I was so angry at others who had wronged me in life. My mind was consumed with thoughts of revenge and hatred the whole day. I even thought up legitimate plans of how I would kill one of the people I hated. Then, I realized how stupid those thoughts were. Death will all come to us eventually, it is not a question of if but when. We like to hide behind thoughts of the future to forget about death, such as "I have 4 awesome years of college and sex life ahead of me" or "I will find love and start a family soon". We see a young, talented, beautiful teenage girl and think, "Wow, she has so much ahead of her". But what exactly is ahead of us? The only thing that's absolutely certain is that we will die. All of us. Good and bad. Beautiful and ugly. Smart and dumb. Rich and poor. One day, we will all be on the other side. I pray that it's a good place, a place where we can at last find eternal peace. I have read countless stories of people who have been clinically dead (no heartbeat or breathing) for minutes. There are some who say they didn't feel anything, it's like they were unconscious or asleep. But the majority of people say that there was some sort of peace on the other side, and they wanted to go back. No relatives, or a God, or a golden city, or clouds, or light, but an incredible peace and darkness. The remainder said that they met a God or their relatives or were in some beautiful place. Interestingly, nobody said they were afraid or in some horrible darkness and pain.
What you believe is ultimately up to you. I do believe that there is peace after death and we do retain some sort of consciousness. So, in the end, hatred and anger towards others is meaningless. Hurting your enemies will not change what they experience after death. We will all experience the same peace or unconsciousness after death. If there is a God, and He judges people based on what they did in life, I would feel even worse for the people who wronged me because they will have a lot to answer for.