It’s like any other job requiring specialized skills. Imagine a plumber came over to your house and did a bunch of stuff, and when he was done, there were a bunch of weird pipes running through your house and you could hear water gurgling in the wall. And he says “it’s incredibly effective”. Do you say, “sure, I mean, I’m not a qualified plumber”? No, at the very least, you’d demand he convince you.
A foundational element of democracy is that government functions are accountable to the citizenry.
The plumber example doesn't work because the stakes are trivially. Lives are at stake with national defense, so we are willing to accept greater extremes if it is what is necessary and effective at protecting us.
A foundational element of democracy is that government functions are accountable to the citizenry.