Why is it that governments aren't doing this job well?
Ronald Reagan may have said it best.
The way political systems are structured, world leaders can't survive in politics without selling out their morals and values to the highest bidder.
Political success is wholly dependent upon money. Campaign contributions. Advertisements. The system has devolved into a "how low can you go" race to the bottom where the most successful politicians are the ones most enthusiastic and successful at selling out their own people to the self interests of ruling elites.
You can see it happen in elections. The candidates with the largest campaign contributions always win. Donald Trump is the first candidate in a very long time to get in office despite having received far less in funding than his opponent. The most successful politicians aren't the ones who do the most to help the public or fuel humanitarian causes. The most successful politicians are the ones who manage to secure the most money.
All of this isn't that obvious to most. The media and politics acting in conjunction creates a type of unified front which create an illusion that the system isn't broken. As time passes however and circumstances grow more dire, the facade will fade.