Why are computers different from your car or your house? Shouldn't you hire someone to drive other people around in your car 24/7? And why not fill to whatever

Why are computers different from your car or your house? Shouldn't you hire someone to drive other people around in your car 24/7? And why not fill to whatever limit fire department sets your house to 24/7? There is so many resources we keep available and do not fully utilize. I don't see why computing devices should be different...