I used to work in defense, and this is not true either. People work in defense because it is effectively a job where you can never lose your job except for absolute gross misconduct, have a hard-cap of 40 hours a week / 80 hours a pay cycle (commonly leads to people working "9/80 schedules" and taking every other friday off), and generally speaking you have a lot of chances to move around org charts when programs change. A "cushy" job with very low chance of being fired with a stable paycheck is valuable to a lot of people.

There are also missions people find valuable, like SBIRS ground, where theoretically real lives are being protected. I know a lot of people who enjoy finding meaning in their work, and there are many programs that bring that level of satisfaction (again, look at things like SBIRS ground).