All savers, even if they aren't founders/owners of companies themselves, create jobs by keeping their money in the financial system. Whether by owning stocks, bonds, private equity funds, or savings accounts, the resources are allocated to where they are needed most. When that whole system dries up, you get a credit crisis.
Obviously, yes, demand is important. Confidence crises can wreak havoc.. but simply saying demand is the only thing that's important is ludicrous when dealing with such a complex and dynamic system.