Isn't it just a limit then? The best politician simply changes his beliefs for every person he talks to until "belief" is so fluid it becomes completely unmoore

Isn't it just a limit then? The best politician simply changes his beliefs for every person he talks to until "belief" is so fluid it becomes completely unmoored and meaningless. Hence no consideration of truth or falsehood and being able to sincerely tell everyone what they want to hear.