Dilma has been charged with corruption herself.  Moreover she was head of both Petrobras and the Government when corruption exploded. 

She knew Temer was a crook, but was willing to overlook that if it got her reelected. Hopefully he will get sent to jail after his term ends.

She falsified budget figures, which was made a specific impeachable offence in the 1990's. It was made a specific offence to stop the kind of economic mismanagement that Dilma employed. She cooked the books, tanked the economy, so she paid the price. 

"and systematic economic sabotage" The only people sabotaging the economy are Maduro and his supporters. If you had a checklist of the  ways a Government can destroy an economy, you'd have ticked off every box in the first ten pages (A4 10 point, single spaced).

Why not Honduras? No idea - doesn't mean we shouldn't sanction Venezuela.

Why not Saudi? Realpolitik - we need the money