An organization does one thing well, its mission statement. It may broaden its focus like Gerber moving from just formula and baby food to toddler snacks. Trying to do Mexican food and adult diapers doesn't fit its model, doesn't work well.
The government is trying to not just follow its core missions - protect the nation from foreign threats, secure the borders, maintain major infrastructure and handle the courts. Instead, it tries to do charitable welfare work, manage the economy, socially engineer the population. 50 years of welfare programs haven't changed the percentage of the population in poverty, so the ever greater number of welfare programs clearly don't work, especially spending a trillion a year so money isn't the issue.
They try to micromanage diets of citizens, so they fail to control Zika or drug resistant TB and EV-86 (polio like virus from central America). Only an idealistic fool says vets are dying for lack of care, let's bring in illegal immigrants and legal refugees with exotic diseases and we'll be able to take care of them, too.
They try to micromanage the economy but can't keep track of billions of dollars in various agencies.
It is trying to do too much, so it does almost everything badly now.