Why do politicians continue to ban events that have no proven nexus with Covid's spread?

For example, the governor of Illinois today entered an order which, among other things, closed museums and movie theaters. Yet there is no consistent, reliable, demonstrable link between the disease and socially distanced, limited capacity museums and movie houses. In fact, recent evidence suggests that the contagion is being propagated primarily by private gatherings. Closing public venues merely seems to increase the likelihood of private functions. I'm tired of being governed by unreason. (I may have just invented that term, but it applies.) I presume politicians do these things in order to protect their reputations, so they can later claim they took every measure possible. Cowardly.