It seems like lots of high level officials are being irresponsible in handling condfidential information.
Either the rules are counter-intuitive, or difficult to follow, or officials are highly incentivized not to follow them.
But for some reason, lots of them aren't.
It makes public accountability very difficult.
Note that this is actually quite different from the Mar-a-Lago case where Trump was asked to return documents, he said he did, then said he didn't have them, then asked people "what if we just said we didn't have them", then he was asked to return them again, and he said he didn't know anything about it.
How exactly are you supposed to respond to the republican weaponization of the investigatory process for partisan political gain?
In the grand scheme of things, it really actually was not a "big deal".
Literally nobody (sane) in the security community would ever say that. On the contrary, they'll tell you that running your own email server for any reason is a whole can of worms that nobody wants to mess with, and if you give them twenty minutes of your time to listen intently, they'll list you a whole laundry-list of reasons why.