Yes and no: you’re right about Vault-Tec, but if we take the TV show as canon (which I vote we do), the guy whose likeness (or at the very least thumb likeness) vault boy is based on was a left wing guy who was horrified to find out how evil Vault-Tec was…
Yeah, because who wouldn’t want to drive a car from a company whose quality control policy is “don’t” that does welding like this?
And fit things together this well
It may be quick and pretty to look at if you don’t inspect it closely, but it has the price tag of a brand new Aston Martin and the build quality of an 80s Yugo.