Because there was only 1 person missing in the entire US of A and no murders during the entire period the press was fixated on her. They have to keep up the circuses because everyone is running out of bread.
Hard to believe, but it is possible to focus on more than one issue at a time.;-)
What’s exceptional about this case is, within 4 days of the bodycam going public, the deceased was allegedly found. And it happened in large part because the camping/van-travel community has a sense of connection via youtube, and people tend to video where they go and what they do at a rate not even imagined 30 years ago. It was a camping-community person who filmed Petito’s van that noone else noticed, and was able to review their footage during a narrow timeframe which gave the police a solid starting gps - with landmarks.
The Petito case may encourage police to be a bit more accepting in some cases of asking for help earlier in the process, so the window of opportunity for the guilty to cover their tracks narrows to days instead of months.
If the MSM is talking about this missing young Petito woman then they're not talking about Pedo Joe Biden and his many many failures and scandals. Nothing more nothing less. The Petito woman case is sucking all the oxygen out of the daily news cycle thus saving Pedo Joe from his many failed press conferences that are getting worse by the day. The WH is so desperate for anything that takes them out of the news spotlight.