They are all briefed to only use government servers so that information cannot be hacked.
The bottom line is, Hillary had some dirty business to do on the web that she did not want record of on a government server, so she used a private server instead. Then when she was caught she deleted the e-mails, many of which we will never see. She did this knowing that top secret information could be hacked, which was a small price to pay for her, even if it cost American lives abroad, which it may have.
Her emails have been released... FBI has read them... Many are out for anybody to read... What was this dirty business you speak of?
What you're talking about, is what I call "dickhead momentum"
It's a concept I heard a comic talk about, and my Dad used to do it.
It's when you're being a dickhead, and then it's pointed out that you're being a dickhead, then you don't stop being a dickhead.
So they got themselves all outraged about some grandiose horrible thing/lie Hillary told, then when it turn out Hillary just didn't know about computers....a thing older conservative men can understand easily....but the GOP and Fox News needed to keep the dickhead momentum going.
So while they don't really have anything to be pissed about....they are all still pissed off