but the argument is that oligarchies are more prone to corruption because power corrupts.
As we see, many republics face problems with all of the above. Including US. Technicalities such as non-majority presidents and strict bipartisan systems...
In certain countries like UK, where apparently ruling party was against the strict referendum results.
In Poland, where the ruling party is changing the judicial branch to their benefit.
Those are not third world banana republics.