When my cat cuddles up to me on the bed, this natural 'life is a fight' law falls to pieces. Beings are capable of generosity without a gaining idea, and most of us have encountered this as part of our lives. I have found that lovingkindness and compassion are boundless in every sentient being's heart.
I think self-identified 'liberals' generally don't have any concrete principles about power itself. As long as it is illegal to not treat all people equally, liberals seem to think government power should increase to the extent that it can relieve suffering and foster generosity. Parts of the left, with its civil libertarians and Proudhon anarchists, think about power in a deeper and more heterodox way...