Proactive is much better than reactive. Leronlimab (as I understand it) works to get the body’s own immune system energized to fight the disease, which is a proactive response. Therefore, with it’s outstanding safety profile, there is good reason to administer Leronlimab pro-actively to prevent any further cytokine storm and more damage to the system.
Who knows at this point what these vaccines, of questionable safety/efficacy, will do at some point down the road. We already have a winner!