That's the point. Why waste money on getting to Mars or farer away? Certainly won't help building weather satellites or something else we need HERE.
Could you have picked a worse example? Getting to Mars in the past has helped us develop new technologies which apply directly to weather satellites. Musk started SpaceX to get to Mars. The Falcon 9 series of rockets is already causing a reduction in price per KG to orbit directly effecting weather satellites.
Good thing you weren't in charge of the purse strings when Columbus went looking for money to "waste" on his expedition.