If you want to understand how economies work never NEVER think of economic activity in terms of money. Economic activity depends on resources – land, labour and capital. If you think in terms of money you will never get it. Money is sometimes scarce but productive resources always are.
Activity isn’t intended to create “jobs”, it’s to create useful products that can be produced at a profit.
Not many people actually want a job. They want and need an income. Governments of course don’t get your last sentence.
Best lesson I’ve learnt from Steve and others who critique Keynes is how Classical Economics was a focus on improving living standards rather than getting more dead end jobs.