Why would RFK and his grandchildren submerge themselves in Rock Creek which contains high bacteria levels, including E. coli?

"Health and Human Services Secretary Robert F. Kennedy Jr. shared photos of himself submerged in Washington, D.C.'s Rock Creek with his grandchildren, despite longstanding warnings that high bacterial levels make the Potomac River tributary unsafe.

"Rock Creek has high levels of bacteria and other infectious pathogens that make swimming, wading, and other contact with the water a hazard to human (and pet) health," the federal agency warns on a webpage for the park.

According to the Environmental Protection Agency, Rock Creek has been found to have "fecal contamination" from sewage and high levels of bacteria, including E. coli."

https://www.yahoo.com/news/robert-f-kennedy-jr-goes-030400241.html