Because the dead can't sue for libel
On the wickedly truthful obit. consider the work of the late, wonderful Hugh Massingberd -- https://www.nytimes.com/2007/12/30/nyregion/30massingberd.html , https://www.theguardian.com/books/2007/dec/31/dailytelegraph.telegraphmediagroup , https://en.wikipedia.org/wiki/Hugh_Massingberd
On the wickedly truthful obit. consider the work of the late, wonderful Hugh Massingberd -- https://www.nytimes.com/2007/12/30/nyregion/30massingberd.html , https://www.theguardian.com/books/2007/dec/31/dailytelegraph.telegraphmediagroup , https://en.wikipedia.org/wiki/Hugh_Massingberd