Re: What's so wrong about a private email server?
You're actually right and wrong at the same time.
The Trump Trolls are right in the whole thing concerning sensitive stuff being sent to/from a private server... even though they're overlooking that the classified stuff was reclassified into the sensitive class after the fact. But...
Hillary had to fire up a private server for her campaign promotion stuff due to the Hatch Act (the one that you may remember was recently aimed at Comey). It forbids use of government resources for political campaigns. Thus *not* using a private server for that stuff would've actually had Hillary breaching the Hatch Act.
Of course, this all may have been avoided if she had simply not done that crap until she stopped working for the Obama Administration.