It's for PR, so that they can publicly release statistics showing good results on paper. An average consumer will learn the good-looking statistics and spread the word about Tesla safety, as it already happens, without taking the above report into account, since it's buried underneath tens of comments and I imagine Tesla will also fight it in some ways. Then, the average consumer will believe that FSD is indeed safer than a human driver, and buy the system. If crash happens, Tesla doesn't provide legal liability. I imagine most cases will be closed and, overall, Tesla will be at a profit, so why not do it?