Even if the most ethical people were elected to high position and we ran out of resources, there would still be lying, cheating, stealing, and corruption. It is not ethical people that are needed but rather a way of intelligently managing the Earth's resources for everyone's well-being.
Nobody trusts anyone in authority today. It is one of the main features of our age. Wherever you look, there are lying politicians, crooked bankers, corrupt police officers, cheating journalists and double-dealing media barons, sinister children's entertainers, rotten and greedy energy companies, and out-of-control security services.