There's a fixed amount of labor capital in the US. Who decides how it should be allocated? Let's pretend you believe we need to hire more teachers. Are you right? If you were the government, you'd wave your hands and make it so. But are you wasting labor on teachers we don't fully utilize? Perhaps we could have really benefited from additional plumbers. How can we know?
The only known way to answer those questions is by asking the capital markets. We all share the goal of best utilizing every citizen to raise our collective standard of living. More broadly, it is in everyone's best interest to efficiently use every type of scare capital resource we are afforded. Waste helps no one.
Now, the fact that the capital markets are distorted and borderline useless today is another discussion. Higher taxes won't solve that problem either.