Don’t forget the culpability of people who may not be fervent supporters, but who don’t want to get involved or inform themselves of what’s going on with their government:

One way or another, any government which remains in power is a representative government. If your city government is a crooked machine, then it is because you and your neighbors prefer it that way - prefer it to the effort of running your own affairs.

Hitler’s government was a popular government; the vast majority of Germans preferred the rule of gangsters to the effort of thinking and doing for themselves. They abdicated their franchise.

…and…

The former Berlin businessman I referred to earlier told me that he blamed his own group, people with the time and the money and the opportunity to know better, for what happened to Germany. “We ignored Hitler,” he said. “We considered him an unimportant fellow, not quite a gentleman, not of our own class. We considered it just a little bit vulgar to bother with him, to bother with politics at all.”

They thought of the government as “They.” The only possible route to a clear conscience in politics is to accept political responsibility, either as an active member of the party in power or as an equally active member of the loyal opposition.

—Robert A. Heinlein, Take Back Your Government