Slowing the growth of the country’s debt. Some would argue this gives flexibility to expand that debt during crises like wars, economic events, or pandemics; by “keeping powder dry” in terms of debt to GDP.
Not taxing the citizens now gives you more room to tax them in the future. Or looking at it another way, cutting those currently implemented taxes can act as a stimulus for the economy, although one with poor measurability compared to other types of stimulus.