The answer to this is crystal clear to me. The biggest legal issue here isn't the kickback scheme. She was conducting "legitimate" State Department business through the private computer because the State Dept. was the conduit for what was being sold in exchange for those donations to the Clinton Foundation.
This wasn't a simple case involving a corrupt political figure taking bribes from donors in exchange for government contracts or other influence in government. This was a case where foreign interests -- businesses and governments alike -- were given control over U.S. government policy and our military and intelligence assets in exchange for the millions of dollars they paid to the Clinton Foundation. How else do you think foreign agents like Huma Abedin find their way into these positions where they have access to such highly classified information?
Well yes...i.e. the uranium mine deal that we heard about. Still..seems to me it would have been possible to keep the legit separate from the corrupt. I suppose before this is over we’ll find out a lot more.