You're assuming they could get someone to underwrite them. The underwriters probably looked at the disaster that was the Karma, correctly concluded the company was a shitshow, and said "nope" or quoted a premium Fisker couldn't afford.
Sounds like Fisker was pinching pennies everywhere they could, so even if they were quoted something they could afford, they probably passed.
Fisker sure fucked the pooch, but even the 'big boys' have royally fucked things up when they really have no excuse given their engineering, design, manufacturing, etc. The Chevy Bolt had tons of problems with its infotainment system, the seats were horrible to sit in, and then the battery defects came to light.
The Ford Mach E is a shitshow in terms of thermal management, overheating at the drop of a hat. The "performance" model is actually slower to accelerate to highway speeds because it overheats faster and throttles back its power.
The BMW i3 was an unreliable lemon that depreciated like a rock once they started coming off lease.
The VW ID3 was full of incredibly shitty UX design decisions and an infotainment system that was so slow it was almost useless - and the system was how you controlled almost everything in the car.
Read forums from when these models came out and you'll often see similar problems to Fisker's. Cars that have a system fail, the dealership struggles to diagnose it because there's poor service training and documentation, and the customer waits for weeks for parts to show up. Software glitches up the ass, etc.
Fisker we can all understand; it's easy to see the problems like terrible leadership and incompetence throughout the org. But at BMW, Ford, GM, VW - it's actually much worse, because on paper they should be the best equipped. They have massive abilities and experience in terms of research, development, design, manufacturing, parts distribution, service, etc - not to mention very deep pockets.
There's really no excuse for the foibles these companies have had, because aside from the drivetrain, everything else can be the same - and the car is massively simpler to boot, with a lower part and system count. There's no exhaust, no emissions control, no fuel, no oil (well, save gear case/diff oil), no hydraulics, cooling needs are much lower, etc.
I think what it came down to is that early EVs are not profitable, so oddly enough, there was probably the same pressure to cut every cost possible, from staffing to component selection to design. Why else, for example, would the ID3 have an infotainment system with a SoC clearly not capable of handling the software it was tasked to run?