better yet/worse yet // slaughter(s)
"Sometimes, a reporter will chatter for a while about celebrity gossip, but then it's back to death and horror, with lots of pictures of crying relatives, or better yet, bloody victims in the hospital."
→Is the phrase of "better yet" used correctly and properly in this sentence? I think it should be "worse yet", not "better yet". Am I right?
"The news anchorman constantly reports stories of slaughters in the streets, accidents, fires, suicides, and crimes, followed by interviews with weeping widows or stunned children about to be sent to an orphanage."
→According to the Oxford dictionary, the word "slaughter" is an uncountable noun. But here it takes a plural form. Is it wrong?