The apparent murder of Khashoggi is a really big deal. But if you supported Obama's attempt to insure Iran had a nuclear weapon, and to then send them a plane load of cash knowing it would pay for terrorism, your opinion is worthless.
I don't think the left really acres about the atrocious murder of Khashoggi any more than the did Obama giving billions to Iran. It's about finding something to criticize Trump about. he has said if Saudi Arabia is responsible, they will pay a heavy price. What more do they think he should do?