But unless the world we are building is a fun place, it will still be unjust. There's no rule that says we can't have fun while we're hastening justice. Remember Lenny Bruce and Mort Sahl. Their humor made laughter into insight. They taught us power also flows from the barrel of laughs.
Justice grows out of joyful service.
In other words, we can have fun while we save the world. Fun also saves you and me. It is fun that makes us whole and that makes life lively and memorable. The funny stories are the ones we tell over and over. Fun is what builds.