They're elected for their political platforms and ideology, not their ability to manage budgets, evidenced by alarming deficit spending. Overwhelmingly across the world, governments have a proven track record of wastefulness, inefficiency and bloat.
In the last few years, elected officials (in the USA) spent over $10 billion on a wall. The previous admin's COVID relief bill included billions towards missiles, warships and other military spending. The current admin's $1T+ infrastructure bill allocates less than half of that amount towards roads, highways, bridges, tunnels, etc.
It includes billions in corporate subsidies and items like over $500M to Alaska including $100M for an airport when no other airport in the country even received $10M (AL senator Shelby is the ranking member of the Appropriations Committee). Middleburg VA gets $2M for a new town hall, and Palo Alto CA gets $3M for their history museum. Giving these people _more_ money is madness.
You just answered the question. Because they are the elected representatives. If you didn't trust them, why did you elect them in the first place?