It is virtually impossible to find any example where leaders are not acting in their own self interest. If you are a democrat you want to gerrymander districts and have an electoral college. This vastly reduces the number of votes a president needs to win an election.

Then tax very highly. It’s much better to decide who gets to eat than to let the people feed themselves. If you lower taxes people will do more work, but then people will get rewards that aren’t coming through you. Everything good must come through you. Look at African farm subsidies. The government buys crops at below market price by force. This is a tax on farmers who then can’t make a profit. So, how do you reward people? The government subsidises fertilisers and hands it back that way. In Tanzania vouchers for fertilisers are handed out not to the most productive areas but to the party loyalist areas.