You don't need "virtue", "honour", and "duty" to have NOT have voted the way people did. It is plain to see which chosen leader will torch the nation and which will not, regardless of people's distaste for the establishment politicians.

It is worse than self interest. It is brazen ignorance.

I am seeing this phenomenon in my country. Once people discover that their beloved leader is corrupt, they just justify with "all politicians are the same". Society becomes so cynic that it very hard to bring change. Politicians are considered corrupt by default, I don't know how that ends.