There is no down side.
The downside would be, we get buffaloed into coming down hard on Saudi Arabia over this unfortunate wet affair.
The truth is, the guy the Saudis took out is Muslim Brotherhood scum, who had a beef with Crown Prince Mohammed bin Salman over the latter's efforts to bring Saudi Arabia into the 21st century. Modernization was against Khashoggi's religion, you see, so he was making himself a pest. The prince's underlings apparently got a little overzealous and took Khashoggi out very clumsily, when they should instead have taken a hint from Sarah Sanders on how to deal with uppity journos.
Khashoggi, you see, is one US person that the US and the world are better off without. But it would have been better to have been so messy about it. I mean, bone saws, sheesh!
The Mexican drug cartels and MS13 do this and worse on a daily basis. Where’s the outrage over that? I don’t give a damn what some Arabian Muslim “prince” does to one of his fellow travelers.