I should think you'd be concerned about your party's leadership questioning a President's legitimacy since that rhetoric made possible the outrages you point out. When you normalize the idea of a President being illegitimate you pave the way for convincing people it's right to prevent a President from assuming or keeping his/her office.

On the latest Trump episode, in my opinion Trump knew exactly what he was doing when he took those files, he knew the DoJ would go after him, and wants the drama that's unfolding. The worst thing the DoJ could've done to Trump was ignore him but instead they somehow thought it sensible pursuing him on a matter of improper behavior surrounding top secret files when not many years ago they let Clinton slide.