Social Security, Medicare, and Medicaid eat the budget and grow on autopilot. Tax cuts are a rounding error compared to demographic tidal waves no politician will touch.
Entitlement growth is the engine. Social Security and Medicare keep expanding as America ages, and that pressure overwhelms the budget year after year.
You can't slash revenue to the bone and act shocked when the country goes into debt. Decades of massive tax cuts for the rich simply bled the treasury dry.
Entitlements are exploding with retirees and will crush the budget. Tax cuts and weak growth are side issues next to mandatory spending.