"It is the job of science to imagine". Yes, that is true. Scientifically speaking please tell me how love and justice evolved.
Ever had a dog? Ever observe a wolf pack? Are you suggesting that love is not useful?
Please give a specific definition of love and justice. It should include a test for the presence of love (or justice) and a way to determine which of two systems contains more love (or justice). It should ideally also provide an absolute measurement scale so that ANY system could be given a number that represents the love (or justice) content of that system.