That's wouldn't be "looking for people with liberal arts degrees", that's "looking for people with demonstrable technical experience" and finding that they just happen to have a liberal arts degree.
As an analogy I'd point to pedigree and breed in a dog show. Your FORMAL education also has a breed (your major/minor) and a pedigree (which schools you attended).
But when it comes to hiring, I'd be looking for the "big dogs". And while breed and pedigree can be a factor (Chihuahua compared to Sheep Dog) I won't exclude the mutts.
If you have the drive and dedication to complete a formal major in one field while spending your free time becoming competitive in a different field then you are someone I should be interviewing.