I (partially) own the government (in theory, if it's a democracy). I don't own the company that I work for.
I can easily choose which company I want to work for, switching countries is something much harder.
A government that does not like what I say can do all sorts of horrible things, jail me, confiscate property and event kill me. Companies generally do not have that power.
And yes, we fire the government all the time. We pay them, and if we don’t like their performance, they’re out. If they start publicly trashing us, they’re out even faster. This is why mayors have to appear meek and apologetic, instead of calling the voters a bunch of fools. Like when half of the population felt like Hillary called them a basket of deplorables, for example. Not many want to hire that person.
Because owning a company doesn't necessarily mean owning people working for it.
Ask yourself the same question about the government, why should your government be expected to keep you as citizen if you criticize their dirty laundry in public.