How does popular sovereignty work without some collective entity imposing accountability on bad actors?

It's simple. Once there are enough sovereign citizens, they can band together and form an agreement to work together for mutual protection. They will probably need to lay out at a minimum what is unacceptable for their group and steer towards common ground. I'm not sure what they should call this group. Since they are steering and Latin is popular for naming things how about we call it something like gubernare? I guess that sounds a bit old fashioned. Maybe French would help? Gouvernement? No sounds too fancy. Government? PERFECT! Let's call it that.