But you'd essentially be making things to kill people. And those people are often innocent civilians.

"I really don't care about the product I work on. "

Literally the first sub-qualification

My friends in that sector all seem to have a lot in common with any other job in a massive corporation. Lots of red tape, hard to advance, but you know your paycheck will clear the bank and nobody's demanding that you put in 100-hour weeks. The difference is the product you're working on, which can range from weapons systems to more mundane things... the "Defense industry" ranges from the assembly line making bullets to the janitorial companies specializing in maintaining military facilities.

In the US, I guess, maybe, depending on the specific defense contractor? I dunno if I'd classify it as the type of low effort OP is looking for.

Also it sounds like OP is in India or China. In China, that is definitely not how defense industry work works. Idk about India.