I think it comes down to "What? You mean I'm not the authority around here?"
Authoritarians are going to have a problem with that. Where there's a $HOLY_BOOK or $HOLY_RELIGION, their schtick is always that truth flows through them.
To be fair, science has some of the same issues. But science has a feedback loop which tries to reality test ideas. So shouting about how right you are and verbally abusing your enemies only ever gets you so far.
Ideologies don't have that. They only have persuasion and rhetoric - which are far more effective as political tools, but far less effective if you'd like to keep your beliefs reasonably close to reality.
Authoritarians are going to have a problem with that. Where there's a $HOLY_BOOK or $HOLY_RELIGION, their schtick is always that truth flows through them.
To be fair, science has some of the same issues. But science has a feedback loop which tries to reality test ideas. So shouting about how right you are and verbally abusing your enemies only ever gets you so far.
Ideologies don't have that. They only have persuasion and rhetoric - which are far more effective as political tools, but far less effective if you'd like to keep your beliefs reasonably close to reality.